Add Extra Probing option, discarding outliers (#14338)

Marlin/Configuration.h

@@ -898,10 +898,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

Marlin/src/inc/Conditionals_LCD.h

@@ -504,19 +504,25 @@
 
 #if HAS_BED_PROBE
   #define USES_Z_MIN_PROBE_ENDSTOP DISABLED(Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN)
+  #define HOMING_Z_WITH_PROBE      (Z_HOME_DIR < 0 && !USES_Z_MIN_PROBE_ENDSTOP)
   #ifndef Z_PROBE_LOW_POINT
     #define Z_PROBE_LOW_POINT -5
   #endif
   #if ENABLED(Z_PROBE_ALLEN_KEY)
     #define PROBE_TRIGGERED_WHEN_STOWED_TEST // Extra test for Allen Key Probe
   #endif
+  #ifdef MULTIPLE_PROBING
+    #if EXTRA_PROBING
+      #define TOTAL_PROBING (MULTIPLE_PROBING + EXTRA_PROBING)
+    #else
+      #define TOTAL_PROBING MULTIPLE_PROBING
+    #endif
+  #endif
 #else
   // Clear probe pin settings when no probe is selected
   #undef Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN
 #endif
 
-#define HOMING_Z_WITH_PROBE (HAS_BED_PROBE && Z_HOME_DIR < 0 && ENABLED(Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN))
-
 #ifdef GRID_MAX_POINTS_X
   #define GRID_MAX_POINTS ((GRID_MAX_POINTS_X) * (GRID_MAX_POINTS_Y))
 #endif

Marlin/src/inc/SanityCheck.h

@@ -1104,8 +1104,14 @@ static_assert(Y_MAX_LENGTH >= Y_BED_SIZE, "Movement bounds (Y_MIN_POS, Y_MAX_POS
     #error "Probes need Z_AFTER_PROBING >= 0."
   #endif
 
-  #if MULTIPLE_PROBING && MULTIPLE_PROBING < 2
+  #if MULTIPLE_PROBING || EXTRA_PROBING
-    #error "MULTIPLE_PROBING must be >= 2."
+    #if !MULTIPLE_PROBING
+      #error "EXTRA_PROBING requires MULTIPLE_PROBING."
+    #elif MULTIPLE_PROBING < 2
+      #error "MULTIPLE_PROBING must be 2 or more."
+    #elif MULTIPLE_PROBING <= EXTRA_PROBING
+      #error "EXTRA_PROBING must be less than MULTIPLE_PROBING."
+    #endif
   #endif
 
   #if Z_PROBE_LOW_POINT > 0

Marlin/src/module/probe.cpp

@@ -584,10 +584,12 @@ static bool do_probe_move(const float z, const float fr_mm_s) {
 }
 
 /**
- * @details Used by probe_pt to do a single Z probe at the current position.
+ * @brief Probe at the current XY (possibly more than once) to find the bed Z.
+ *
+ * @details Used by probe_pt to get the bed Z height at the current XY.
  *          Leaves current_position[Z_AXIS] at the height where the probe triggered.
  *
- * @return The raw Z position where the probe was triggered
+ * @return The Z position of the bed at the current XY or NAN on error.
  */
 static float run_z_probe() {
 
@@ -598,7 +600,7 @@ static float run_z_probe() {
   const float z_probe_low_point = TEST(axis_known_position, Z_AXIS) ? -zprobe_zoffset + Z_PROBE_LOW_POINT : -10.0;
 
   // Double-probing does a fast probe followed by a slow probe
-  #if MULTIPLE_PROBING == 2
+  #if TOTAL_PROBING == 2
 
     // Do a first probe at the fast speed
     if (do_probe_move(z_probe_low_point, MMM_TO_MMS(Z_PROBE_SPEED_FAST))) {
@@ -609,11 +611,11 @@ static float run_z_probe() {
       return NAN;
     }
 
-    float first_probe_z = current_position[Z_AXIS];
+    const float first_probe_z = current_position[Z_AXIS];
 
     if (DEBUGGING(LEVELING)) DEBUG_ECHOLNPAIR("1st Probe Z:", first_probe_z);
 
-    // move up to make clearance for the probe
+    // Raise to give the probe clearance
     do_blocking_move_to_z(current_position[Z_AXIS] + Z_CLEARANCE_MULTI_PROBE, MMM_TO_MMS(Z_PROBE_SPEED_FAST));
 
   #elif Z_PROBE_SPEED_FAST != Z_PROBE_SPEED_SLOW
@@ -622,18 +624,28 @@ static float run_z_probe() {
     // move down quickly before doing the slow probe
     const float z = Z_CLEARANCE_DEPLOY_PROBE + 5.0 + (zprobe_zoffset < 0 ? -zprobe_zoffset : 0);
     if (current_position[Z_AXIS] > z) {
-      // If we don't make it to the z position (i.e. the probe triggered), move up to make clearance for the probe
+      // Probe down fast. If the probe never triggered, raise for probe clearance
       if (!do_probe_move(z, MMM_TO_MMS(Z_PROBE_SPEED_FAST)))
         do_blocking_move_to_z(current_position[Z_AXIS] + Z_CLEARANCE_BETWEEN_PROBES, MMM_TO_MMS(Z_PROBE_SPEED_FAST));
     }
   #endif
 
-  #if MULTIPLE_PROBING > 2
+  #ifdef EXTRA_PROBING
-    float probes_total = 0;
+    float probes[TOTAL_PROBING];
-    for (uint8_t p = MULTIPLE_PROBING + 1; --p;) {
   #endif
 
-      // move down slowly to find bed
+  #if TOTAL_PROBING > 2
+    float probes_total = 0;
+    for (
+      #if EXTRA_PROBING
+        uint8_t p = 0; p < TOTAL_PROBING; p++
+      #else
+        uint8_t p = TOTAL_PROBING; p--;
+      #endif
+    )
+  #endif
+    {
+      // Probe downward slowly to find the bed
       if (do_probe_move(z_probe_low_point, MMM_TO_MMS(Z_PROBE_SPEED_SLOW))) {
         if (DEBUGGING(LEVELING)) {
           DEBUG_ECHOLNPGM("SLOW Probe fail!");
@@ -646,18 +658,54 @@ static float run_z_probe() {
         backlash.measure_with_probe();
       #endif
 
-  #if MULTIPLE_PROBING > 2
+      const float z = current_position[Z_AXIS];
-      probes_total += current_position[Z_AXIS];
+
-      if (p > 1) do_blocking_move_to_z(current_position[Z_AXIS] + Z_CLEARANCE_MULTI_PROBE, MMM_TO_MMS(Z_PROBE_SPEED_FAST));
+      #if EXTRA_PROBING
+        // Insert Z measurement into probes[]. Keep it sorted ascending.
+        for (uint8_t i = 0; i <= p; i++) {                            // Iterate the saved Zs to insert the new Z
+          if (i == p || probes[i] > z) {       // Last index or new Z is smaller than this Z
+            for (int8_t m = p; --m >= i;) probes[m + 1] = probes[m];  // Shift items down after the insertion point
+            probes[i] = z;                     // Insert the new Z measurement
+            break;                                                    // Only one to insert. Done!
+          }
+        }
+      #elif TOTAL_PROBING > 2
+        probes_total += z;
+      #endif
+
+      #if TOTAL_PROBING > 2
+        // Small Z raise after all but the last probe
+        if (p
+          #if EXTRA_PROBING
+            < TOTAL_PROBING - 1
+          #endif
+        ) do_blocking_move_to_z(z + Z_CLEARANCE_MULTI_PROBE, MMM_TO_MMS(Z_PROBE_SPEED_FAST));
+      #endif
     }
-  #endif
 
-  #if MULTIPLE_PROBING > 2
+  #if TOTAL_PROBING > 2
+
+    #if EXTRA_PROBING
+      // Take the center value (or average the two middle values) as the median
+      static constexpr int PHALF = (TOTAL_PROBING - 1) / 2;
+      const float middle = probes[PHALF],
+                  median = ((TOTAL_PROBING) & 1) ? middle : (middle + probes[PHALF + 1]) * 0.5f;
+
+      // Remove values farthest from the median
+      uint8_t min_avg_idx = 0, max_avg_idx = TOTAL_PROBING - 1;
+      for (uint8_t i = EXTRA_PROBING; i--;)
+        if (ABS(probes[max_avg_idx] - median) > ABS(probes[min_avg_idx] - median))
+          max_avg_idx--; else min_avg_idx++;
+
+      // Return the average value of all remaining probes.
+      for (uint8_t i = min_avg_idx; i <= max_avg_idx; i++)
+        probes_total += probes[i];
+
+    #endif
 
-    // Return the average value of all probes
     const float measured_z = probes_total * (1.0f / (MULTIPLE_PROBING));
 
-  #elif MULTIPLE_PROBING == 2
+  #elif TOTAL_PROBING == 2
 
     const float z2 = current_position[Z_AXIS];
 

config/default/Configuration.h

@@ -898,10 +898,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/3DFabXYZ/Migbot/Configuration.h

@@ -904,10 +904,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/AlephObjects/TAZ4/Configuration.h

@@ -918,10 +918,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/AliExpress/CL-260/Configuration.h

@@ -898,10 +898,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/AliExpress/UM2pExt/Configuration.h

@@ -909,10 +909,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Anet/A2/Configuration.h

@@ -898,10 +898,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 //#define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Anet/A2plus/Configuration.h

@@ -898,10 +898,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 //#define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Anet/A6/Configuration.h

@@ -967,10 +967,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 3)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 #define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Anet/A8/Configuration.h

@@ -911,10 +911,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Anet/A8plus/Configuration.h

@@ -909,10 +909,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Anet/E16/Configuration.h

@@ -910,10 +910,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/AnyCubic/i3/Configuration.h

@@ -908,10 +908,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/ArmEd/Configuration.h

@@ -899,10 +899,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Azteeg/X5GT/Configuration.h

@@ -898,10 +898,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/BIBO/TouchX/cyclops/Configuration.h

@@ -898,10 +898,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/BIBO/TouchX/default/Configuration.h

@@ -898,10 +898,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/BQ/Hephestos/Configuration.h

@@ -886,10 +886,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/BQ/Hephestos_2/Configuration.h

@@ -899,10 +899,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/BQ/WITBOX/Configuration.h

@@ -886,10 +886,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Cartesio/Configuration.h

@@ -897,10 +897,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Creality/CR-10/Configuration.h

@@ -908,10 +908,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Creality/CR-10S/Configuration.h

@@ -898,10 +898,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Creality/CR-10_5S/Configuration.h

@@ -899,10 +899,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Creality/CR-10mini/Configuration.h

@@ -917,10 +917,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Creality/CR-8/Configuration.h

@@ -908,10 +908,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Creality/Ender-2/Configuration.h

@@ -902,10 +902,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Creality/Ender-3/Configuration.h

@@ -902,10 +902,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Creality/Ender-4/Configuration.h

@@ -908,10 +908,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Dagoma/Disco Ultimate/Configuration.h

@@ -898,10 +898,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 #define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/EVNOVO (Artillery)/Sidewinder X1/Configuration.h

@@ -903,10 +903,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Einstart-S/Configuration.h

@@ -908,10 +908,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Felix/Configuration.h

@@ -880,10 +880,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Felix/DUAL/Configuration.h

@@ -880,10 +880,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/FlashForge/CreatorPro/Configuration.h

@@ -890,10 +890,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/FolgerTech/i3-2020/Configuration.h

@@ -904,10 +904,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Formbot/Raptor/Configuration.h

@@ -979,10 +979,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 #define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Formbot/T_Rex_2+/Configuration.h

@@ -927,10 +927,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Formbot/T_Rex_3/Configuration.h

@@ -914,10 +914,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Geeetech/A10/Configuration.h

@@ -881,10 +881,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 #define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Geeetech/A10M/Configuration.h

@@ -881,10 +881,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 #define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Geeetech/A20M/Configuration.h

@@ -881,10 +881,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 #define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Geeetech/GT2560/Configuration.h

@@ -913,10 +913,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Geeetech/I3_Pro_X-GT2560/Configuration.h

@@ -898,10 +898,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Geeetech/MeCreator2/Configuration.h

@@ -905,10 +905,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Geeetech/Prusa i3 Pro B/bltouch/Configuration.h

@@ -919,10 +919,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 #define MULTIPLE_PROBING 3
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Geeetech/Prusa i3 Pro B/noprobe/Configuration.h

@@ -918,10 +918,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Geeetech/Prusa i3 Pro C/Configuration.h

@@ -898,10 +898,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Geeetech/Prusa i3 Pro W/Configuration.h

@@ -898,10 +898,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Infitary/i3-M508/Configuration.h

@@ -902,10 +902,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/JGAurora/A1/Configuration.h

@@ -900,10 +900,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/JGAurora/A5/Configuration.h

@@ -910,10 +910,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/JGAurora/A5S/Configuration.h

@@ -900,10 +900,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/MakerParts/Configuration.h

@@ -918,10 +918,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Malyan/M150/Configuration.h

@@ -922,10 +922,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 //#define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Malyan/M200/Configuration.h

@@ -897,10 +897,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Micromake/C1/basic/Configuration.h

@@ -902,10 +902,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Micromake/C1/enhanced/Configuration.h

@@ -902,10 +902,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 #define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Mks/Robin/Configuration.h

@@ -899,10 +899,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Mks/Sbase/Configuration.h

@@ -898,10 +898,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Printrbot/PrintrboardG2/Configuration.h

@@ -906,10 +906,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/RapideLite/RL200/Configuration.h

@@ -898,10 +898,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/RepRapPro/Huxley/Configuration.h

@@ -938,10 +938,17 @@ Black rubber belt(MXL), 18 - tooth aluminium pulley : 87.489 step per mm (Huxley
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/RepRapWorld/Megatronics/Configuration.h

@@ -898,10 +898,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/RigidBot/Configuration.h

@@ -896,10 +896,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/SCARA/Configuration.h

@@ -911,10 +911,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/STM32/Black_STM32F407VET6/Configuration.h

@@ -898,10 +898,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/STM32/STM32F10/Configuration.h

@@ -900,10 +900,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/STM32/STM32F4/Configuration.h

@@ -898,10 +898,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/STM32/stm32f103ret6/Configuration.h

@@ -900,10 +900,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Sanguinololu/Configuration.h

@@ -929,10 +929,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/TheBorg/Configuration.h

@@ -898,10 +898,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 #define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/TinyBoy2/Configuration.h

@@ -949,10 +949,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Tronxy/X1/Configuration.h

@@ -898,10 +898,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Tronxy/X3A/Configuration.h

@@ -898,10 +898,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 #define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Tronxy/X5S-2E/Configuration.h

@@ -919,10 +919,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Tronxy/X5S/Configuration.h

@@ -898,10 +898,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Tronxy/XY100/Configuration.h

@@ -909,10 +909,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/UltiMachine/Archim1/Configuration.h

@@ -898,10 +898,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/UltiMachine/Archim2/Configuration.h

@@ -898,10 +898,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/VORONDesign/Configuration.h

@@ -907,10 +907,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Velleman/K8200/Configuration.h

@@ -927,10 +927,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Velleman/K8400/Configuration.h

@@ -898,10 +898,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Velleman/K8400/Dual-head/Configuration.h

@@ -898,10 +898,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/WASP/PowerWASP/Configuration.h

@@ -917,10 +917,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/Wanhao/Duplicator 6/Configuration.h

@@ -908,10 +908,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/adafruit/ST7565/Configuration.h

@@ -898,10 +898,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/delta/Anycubic/Kossel/Configuration.h

@@ -1084,10 +1084,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 3)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 #define MULTIPLE_PROBING 3
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/delta/FLSUN/auto_calibrate/Configuration.h

@@ -1026,10 +1026,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST) / 6
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/delta/FLSUN/kossel/Configuration.h

@@ -1025,10 +1025,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST) / 6
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/delta/FLSUN/kossel_mini/Configuration.h

@@ -1025,10 +1025,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 #define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/delta/Geeetech/Rostock 301/Configuration.h

@@ -1013,10 +1013,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/delta/Hatchbox_Alpha/Configuration.h

@@ -1028,10 +1028,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 4)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 #define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/delta/MKS/SBASE/Configuration.h

@@ -1013,10 +1013,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/delta/Tevo Little Monster/Configuration.h

@@ -1017,10 +1017,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/delta/generic/Configuration.h

@@ -1013,10 +1013,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between

config/examples/delta/kossel_mini/Configuration.h

@@ -1015,10 +1015,17 @@
 // Feedrate (mm/m) for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-// The number of probes to perform at each point.
+/**
-//   Set to 2 for a fast/slow probe, using the second probe result.
+ * Multiple Probing
-//   Set to 3 or more for slow probes, averaging the results.
+ *
+ * You may get improved results by probing 2 or more times.
+ * With EXTRA_PROBING the more atypical reading(s) will be disregarded.
+ *
+ * A total of 2 does fast/slow probes with a weighted average.
+ * A total of 3 or more adds more slow probes, taking the average.
+ */
 //#define MULTIPLE_PROBING 2
+//#define EXTRA_PROBING    1
 
 /**
  * Z probes require clearance when deploying, stowing, and moving between