G425 — Auto-calibrate Backlash and Nozzle Offsets (#13050)

Marlin/src/config/examples/Anet/A8/Configuration_adv.h

@@ -520,6 +520,59 @@
   #endif
 #endif
 
+/**
+ * Automatic backlash, position and hotend offset calibration
+ *
+ * Enable G425 to run automatic calibration using an electrically-
+ * conductive cube, bolt, or washer mounted on the bed.
+ *
+ * G425 uses the probe to touch the top and sides of the calibration object
+ * on the bed and measures and/or correct positional offsets, axis backlash
+ * and hotend offsets.
+ *
+ * Note: HOTEND_OFFSET and CALIBRATION_OBJECT_CENTER must be set to within
+ *       ±5mm of true values for G425 to succeed.
+ */
+//#define CALIBRATION_GCODE
+#if ENABLED(CALIBRATION_GCODE)
+
+  #define CALIBRATION_MEASUREMENT_RESOLUTION     0.01 // mm
+
+  #define CALIBRATION_FEEDRATE_SLOW             60    // mm/m
+  #define CALIBRATION_FEEDRATE_FAST           1200    // mm/m
+  #define CALIBRATION_FEEDRATE_TRAVEL         3000    // mm/m
+
+  // The following parameters refer to the conical section of the nozzle tip.
+  #define CALIBRATION_NOZZLE_TIP_HEIGHT          1.0  // mm
+  #define CALIBRATION_NOZZLE_OUTER_DIAMETER      2.0  // mm
+
+  // Uncomment to enable reporting (required for "G425 V", but consumes PROGMEM).
+  //#define CALIBRATION_REPORTING
+
+  // The true location and dimension the cube/bolt/washer on the bed.
+  #define CALIBRATION_OBJECT_CENTER     { 264.0, -22.0,  -2.0} // mm
+  #define CALIBRATION_OBJECT_DIMENSIONS {  10.0,  10.0,  10.0} // mm
+
+  // Comment out any sides which are unreachable by the probe. For best
+  // auto-calibration results, all sides must be reachable.
+  #define CALIBRATION_MEASURE_RIGHT
+  #define CALIBRATION_MEASURE_FRONT
+  #define CALIBRATION_MEASURE_LEFT
+  #define CALIBRATION_MEASURE_BACK
+
+  // Probing at the exact top center only works if the center is flat. If
+  // probing on a screwhead or hollow washer, probe near the edges.
+  //#define CALIBRATION_MEASURE_AT_TOP_EDGES
+
+  // Define pin which is read during calibration
+  #ifndef CALIBRATION_PIN
+    #define CALIBRATION_PIN -1 // Override in pins.h or set to -1 to use your Z endstop
+    #define CALIBRATION_PIN_INVERTING false // set to true to invert the pin
+    //#define CALIBRATION_PIN_PULLDOWN
+    #define CALIBRATION_PIN_PULLUP
+  #endif
+#endif
+
 /**
  * Adaptive Step Smoothing increases the resolution of multi-axis moves, particularly at step frequencies
  * below 1kHz (for AVR) or 10kHz (for ARM), where aliasing between axes in multi-axis moves causes audible