Fix doubling of MIN_PROBE_EDGE for default ABL G29.

Marlin/src/core/utility.cpp

@@ -81,40 +81,49 @@ void safe_delay(millis_t ms) {
     );
 
     #if HAS_BED_PROBE
-      SERIAL_ECHOPAIR_P(PSTR("Probe Offset X"), probe_offset.x, SP_Y_STR, probe_offset.y, SP_Z_STR, probe_offset.z);
-      if (probe_offset.x > 0)
-        SERIAL_ECHOPGM(" (Right");
-      else if (probe_offset.x < 0)
-        SERIAL_ECHOPGM(" (Left");
-      else if (probe_offset.y != 0)
-        SERIAL_ECHOPGM(" (Middle");
-      else
-        SERIAL_ECHOPGM(" (Aligned With");
 
-      if (probe_offset.y > 0) {
-        #if IS_SCARA
-          SERIAL_ECHOPGM("-Distal");
-        #else
-          SERIAL_ECHOPGM("-Back");
-        #endif
-      }
-      else if (probe_offset.y < 0) {
-        #if IS_SCARA
-          SERIAL_ECHOPGM("-Proximal");
-        #else
-          SERIAL_ECHOPGM("-Front");
-        #endif
-      }
-      else if (probe_offset.x != 0)
-        SERIAL_ECHOPGM("-Center");
+      #if !HAS_PROBE_XY_OFFSET
+        SERIAL_ECHOPAIR("Probe Offset X0 Y0 Z", probe_offset.z, " (");
+      #else
+        SERIAL_ECHOPAIR_P(PSTR("Probe Offset X"), probe_offset.x, SP_Y_STR, probe_offset.y, SP_Z_STR, probe_offset.z);
+        if (probe_offset.x > 0)
+          SERIAL_ECHOPGM(" (Right");
+        else if (probe_offset.x < 0)
+          SERIAL_ECHOPGM(" (Left");
+        else if (probe_offset.y != 0)
+          SERIAL_ECHOPGM(" (Middle");
+        else
+          SERIAL_ECHOPGM(" (Aligned With");
+
+        if (probe_offset.y > 0) {
+          #if IS_SCARA
+            SERIAL_ECHOPGM("-Distal");
+          #else
+            SERIAL_ECHOPGM("-Back");
+          #endif
+        }
+        else if (probe_offset.y < 0) {
+          #if IS_SCARA
+            SERIAL_ECHOPGM("-Proximal");
+          #else
+            SERIAL_ECHOPGM("-Front");
+          #endif
+        }
+        else if (probe_offset.x != 0)
+          SERIAL_ECHOPGM("-Center");
+
+        SERIAL_ECHOPGM(" & ");
+
+      #endif
 
       if (probe_offset.z < 0)
-        SERIAL_ECHOPGM(" & Below");
+        SERIAL_ECHOPGM("Below");
       else if (probe_offset.z > 0)
-        SERIAL_ECHOPGM(" & Above");
+        SERIAL_ECHOPGM("Above");
       else
-        SERIAL_ECHOPGM(" & Same Z as");
+        SERIAL_ECHOPGM("Same Z as");
       SERIAL_ECHOLNPGM(" Nozzle)");
+
     #endif
 
     #if HAS_ABL_OR_UBL

Marlin/src/feature/bedlevel/ubl/ubl.cpp

@@ -176,7 +176,7 @@
     // Add XY probe offset from extruder because probe_at_point() subtracts them when
     // moving to the XY position to be measured. This ensures better agreement between
     // the current Z position after G28 and the mesh values.
-    const xy_int8_t curr = closest_indexes(xy_pos_t(current_position) + xy_pos_t(probe_offset));
+    const xy_int8_t curr = closest_indexes(xy_pos_t(current_position) + probe_offset_xy);
 
     if (!lcd) SERIAL_EOL();
     for (int8_t j = GRID_MAX_POINTS_Y - 1; j >= 0; j--) {

Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp

@@ -450,7 +450,7 @@
               SERIAL_ECHO(g29_pos.y);
               SERIAL_ECHOLNPGM(").\n");
             }
-            const xy_pos_t near = g29_pos + probe_offset;
+            const xy_pos_t near = g29_pos + probe_offset_xy;
             probe_entire_mesh(near, parser.seen('T'), parser.seen('E'), parser.seen('U'));
 
             report_current_position();
@@ -468,6 +468,7 @@
             do_blocking_move_to_z(Z_CLEARANCE_BETWEEN_PROBES);
 
             if (parser.seen('C') && !xy_seen) {
+
               /**
                * Use a good default location for the path.
                * The flipped > and < operators in these comparisons is intentional.
@@ -479,8 +480,8 @@
                 #if IS_KINEMATIC
                   X_HOME_POS, Y_HOME_POS
                 #else
-                  probe_offset.x > 0 ? X_BED_SIZE : 0,
-                  probe_offset.y < 0 ? Y_BED_SIZE : 0
+                  probe_offset_xy.x > 0 ? X_BED_SIZE : 0,
+                  probe_offset_xy.y < 0 ? Y_BED_SIZE : 0
                 #endif
               );
             }
@@ -805,8 +806,8 @@
       restore_ubl_active_state_and_leave();
 
       do_blocking_move_to_xy(
-        constrain(near.x - probe_offset.x, MESH_MIN_X, MESH_MAX_X),
-        constrain(near.y - probe_offset.y, MESH_MIN_Y, MESH_MAX_Y)
+        constrain(near.x - probe_offset_xy.x, MESH_MIN_X, MESH_MAX_X),
+        constrain(near.y - probe_offset_xy.y, MESH_MIN_Y, MESH_MAX_Y)
       );
     }
 
@@ -1293,7 +1294,7 @@
     closest.distance = -99999.9f;
 
     // Get the reference position, either nozzle or probe
-    const xy_pos_t ref = probe_relative ? pos + probe_offset : pos;
+    const xy_pos_t ref = probe_relative ? pos + probe_offset_xy : pos;
 
     float best_so_far = 99999.99f;
 

Marlin/src/gcode/bedlevel/G42.cpp

@@ -45,20 +45,21 @@ void GcodeSuite::G42() {
       return;
     }
 
+    // Move to current_position, as modified by I, J, P parameters
     destination = current_position;
 
     if (hasI) destination.x = _GET_MESH_X(ix);
     if (hasJ) destination.y = _GET_MESH_Y(iy);
 
-    #if HAS_BED_PROBE
+    #if HAS_PROBE_XY_OFFSET
       if (parser.boolval('P')) {
-        if (hasI) destination.x -= probe_offset.x;
-        if (hasJ) destination.y -= probe_offset.y;
+        if (hasI) destination.x -= probe_offset_xy.x;
+        if (hasJ) destination.y -= probe_offset_xy.y;
       }
     #endif
 
     const feedRate_t fval = parser.linearval('F'),
-                     fr_mm_s = fval > 0 ? MMM_TO_MMS(fval) : 0.0f;
+                     fr_mm_s = MMM_TO_MMS(fval > 0 ? fval : 0.0f);
 
     // SCARA kinematic has "safe" XY raw moves
     #if IS_SCARA

Marlin/src/gcode/bedlevel/abl/G29.cpp

@@ -228,7 +228,7 @@ G29_TYPE GcodeSuite::G29() {
       ABL_VAR xy_int8_t meshCount;
     #endif
 
-    ABL_VAR xy_float_t probe_position_lf, probe_position_rb;
+    ABL_VAR xy_pos_t probe_position_lf, probe_position_rb;
     ABL_VAR xy_float_t gridSpacing = { 0, 0 };
 
     #if ENABLED(AUTO_BED_LEVELING_LINEAR)
@@ -403,14 +403,13 @@ G29_TYPE GcodeSuite::G29() {
       }
       else {
         probe_position_lf.set(
-          parser.seenval('L') ? (int)RAW_X_POSITION(parser.value_linear_units()) : (_MAX(x_min, X_CENTER - (X_BED_SIZE) / 2)      + MIN_PROBE_EDGE_LEFT),
-          parser.seenval('F') ? (int)RAW_Y_POSITION(parser.value_linear_units()) : (_MAX(y_min, Y_CENTER - (Y_BED_SIZE) / 2)      + MIN_PROBE_EDGE_FRONT)
+          parser.seenval('L') ? RAW_X_POSITION(parser.value_linear_units()) : x_min,
+          parser.seenval('F') ? RAW_Y_POSITION(parser.value_linear_units()) : y_min
         );
         probe_position_rb.set(
-          parser.seenval('R') ? (int)RAW_X_POSITION(parser.value_linear_units()) : (_MIN(x_max, probe_position_lf.x + X_BED_SIZE) - MIN_PROBE_EDGE_RIGHT),
-          parser.seenval('B') ? (int)RAW_Y_POSITION(parser.value_linear_units()) : (_MIN(y_max, probe_position_lf.y + Y_BED_SIZE) - MIN_PROBE_EDGE_BACK)
+          parser.seenval('R') ? RAW_X_POSITION(parser.value_linear_units()) : x_max,
+          parser.seenval('B') ? RAW_Y_POSITION(parser.value_linear_units()) : y_max
         );
-        SERIAL_ECHOLN("Set Trail 1");
       }
 
       if (
@@ -911,8 +910,8 @@ G29_TYPE GcodeSuite::G29() {
         planner.force_unapply_leveling(converted); // use conversion machinery
 
         // Use the last measured distance to the bed, if possible
-        if ( NEAR(current_position.x, probePos.x - probe_offset.x)
-          && NEAR(current_position.y, probePos.y - probe_offset.y)
+        if ( NEAR(current_position.x, probePos.x - probe_offset_xy.x)
+          && NEAR(current_position.y, probePos.y - probe_offset_xy.y)
         ) {
           const float simple_z = current_position.z - measured_z;
           if (DEBUGGING(LEVELING)) DEBUG_ECHOLNPAIR("Probed Z", simple_z, "  Matrix Z", converted.z, "  Discrepancy ", simple_z - converted.z);

Marlin/src/gcode/calibrate/G28.cpp

@@ -133,7 +133,7 @@
     destination.set(safe_homing_xy, current_position.z);
 
     #if HOMING_Z_WITH_PROBE
-      destination -= probe_offset;
+      destination -= probe_offset_xy;
     #endif
 
     if (position_is_reachable(destination)) {

Marlin/src/gcode/calibrate/M48.cpp

@@ -77,8 +77,8 @@ void GcodeSuite::M48() {
   xy_float_t next_pos = current_position;
 
   const xy_pos_t probe_pos = {
-    parser.linearval('X', next_pos.x + probe_offset.x),
-    parser.linearval('Y', next_pos.y + probe_offset.y)
+    parser.linearval('X', next_pos.x + probe_offset_xy.x),
+    parser.linearval('Y', next_pos.y + probe_offset_xy.y)
   };
 
   if (!position_is_reachable_by_probe(probe_pos)) {
@@ -166,8 +166,9 @@ void GcodeSuite::M48() {
           while (angle < 0.0) angle += 360.0;   // outside of this range.   It looks like they behave correctly with
                                                 // numbers outside of the range, but just to be safe we clamp them.
 
-          next_pos.set(probe_pos.x - probe_offset.x + cos(RADIANS(angle)) * radius,
-                       probe_pos.y - probe_offset.y + sin(RADIANS(angle)) * radius);
+          const xy_pos_t noz_pos = probe_pos - probe_offset_xy;
+          next_pos.set(noz_pos.x + cos(RADIANS(angle)) * radius,
+                       noz_pos.y + sin(RADIANS(angle)) * radius);
 
           #if DISABLED(DELTA)
             LIMIT(next_pos.x, X_MIN_POS, X_MAX_POS);

Marlin/src/gcode/probe/G30.cpp

@@ -39,8 +39,9 @@
  *   E   Engage the probe for each probe (default 1)
  */
 void GcodeSuite::G30() {
-  const xy_pos_t pos = { parser.linearval('X', current_position.x + probe_offset.x),
-                         parser.linearval('Y', current_position.y + probe_offset.y) };
+
+  const xy_pos_t pos = { parser.linearval('X', current_position.x + probe_offset_xy.x),
+                         parser.linearval('Y', current_position.y + probe_offset_xy.y) };
 
   if (!position_is_reachable_by_probe(pos)) return;
 

Marlin/src/gcode/probe/M851.cpp

@@ -37,32 +37,49 @@ void GcodeSuite::M851() {
 
   // Show usage with no parameters
   if (!parser.seen("XYZ")) {
-    SERIAL_ECHOLNPAIR_P(PSTR(MSG_PROBE_OFFSET " X"), probe_offset.x, SP_Y_STR, probe_offset.y, SP_Z_STR, probe_offset.z);
+    SERIAL_ECHOLNPAIR_P(
+      #if HAS_PROBE_XY_OFFSET
+        PSTR(MSG_PROBE_OFFSET " X"), probe_offset.x, SP_Y_STR, probe_offset.y, SP_Z_STR
+      #else
+        PSTR(MSG_PROBE_OFFSET " X0 Y0 Z")
+      #endif
+      , probe_offset.z
+    );
     return;
   }
 
+  // Start with current offsets and modify
   xyz_pos_t offs = probe_offset;
 
+  // Assume no errors
   bool ok = true;
 
   if (parser.seenval('X')) {
     const float x = parser.value_float();
-    if (WITHIN(x, -(X_BED_SIZE), X_BED_SIZE))
-      offs.x = x;
-    else {
-      SERIAL_ECHOLNPAIR("?X out of range (-", int(X_BED_SIZE), " to ", int(X_BED_SIZE), ")");
-      ok = false;
-    }
+    #if HAS_PROBE_XY_OFFSET
+      if (WITHIN(x, -(X_BED_SIZE), X_BED_SIZE))
+        offs.x = x;
+      else {
+        SERIAL_ECHOLNPAIR("?X out of range (-", int(X_BED_SIZE), " to ", int(X_BED_SIZE), ")");
+        ok = false;
+      }
+    #else
+      if (x) SERIAL_ECHOLNPAIR("?X must be 0 (NOZZLE_AS_PROBE)."); // ...but let 'ok' stay true
+    #endif
   }
 
   if (parser.seenval('Y')) {
     const float y = parser.value_float();
-    if (WITHIN(y, -(Y_BED_SIZE), Y_BED_SIZE))
-      offs.y = y;
-    else {
-      SERIAL_ECHOLNPAIR("?Y out of range (-", int(Y_BED_SIZE), " to ", int(Y_BED_SIZE), ")");
-      ok = false;
-    }
+    #if HAS_PROBE_XY_OFFSET
+      if (WITHIN(y, -(Y_BED_SIZE), Y_BED_SIZE))
+        offs.y = y;
+      else {
+        SERIAL_ECHOLNPAIR("?Y out of range (-", int(Y_BED_SIZE), " to ", int(Y_BED_SIZE), ")");
+        ok = false;
+      }
+    #else
+      if (y) SERIAL_ECHOLNPAIR("?Y must be 0 (NOZZLE_AS_PROBE)."); // ...but let 'ok' stay true
+    #endif
   }
 
   if (parser.seenval('Z')) {

Marlin/src/inc/Conditionals_LCD.h

@@ -500,6 +500,7 @@
 #define PROBE_SELECTED (HAS_BED_PROBE || EITHER(PROBE_MANUALLY, MESH_BED_LEVELING))
 
 #if HAS_BED_PROBE
+  #define HAS_PROBE_XY_OFFSET   DISABLED(NOZZLE_AS_PROBE)
   #define HAS_CUSTOM_PROBE_PIN  DISABLED(Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN)
   #define HOMING_Z_WITH_PROBE   (Z_HOME_DIR < 0 && !HAS_CUSTOM_PROBE_PIN)
   #ifndef Z_PROBE_LOW_POINT

Marlin/src/inc/SanityCheck.h

@@ -1149,6 +1149,20 @@ static_assert(Y_MAX_LENGTH >= Y_BED_SIZE, "Movement bounds (Y_MIN_POS, Y_MAX_POS
     #error "Z_MIN_PROBE_PIN must be defined if Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN is not enabled."
   #endif
 
+  #if ENABLED(NOZZLE_AS_PROBE)
+    constexpr float sanity_nozzle_to_probe_offset[] = NOZZLE_TO_PROBE_OFFSET;
+    static_assert(sanity_nozzle_to_probe_offset[0] == 0.0 && sanity_nozzle_to_probe_offset[1] == 0.0,
+                  "NOZZLE_AS_PROBE requires the X,Y offsets in NOZZLE_TO_PROBE_OFFSET to be 0,0.");
+  #endif
+
+  #if DISABLED(NOZZLE_AS_PROBE)
+    static_assert(MIN_PROBE_EDGE >= 0, "MIN_PROBE_EDGE must be >= 0.");
+    static_assert(MIN_PROBE_EDGE_BACK >= 0, "MIN_PROBE_EDGE_BACK must be >= 0.");
+    static_assert(MIN_PROBE_EDGE_FRONT >= 0, "MIN_PROBE_EDGE_FRONT must be >= 0.");
+    static_assert(MIN_PROBE_EDGE_LEFT >= 0, "MIN_PROBE_EDGE_LEFT must be >= 0.");
+    static_assert(MIN_PROBE_EDGE_RIGHT >= 0, "MIN_PROBE_EDGE_RIGHT must be >= 0.");
+  #endif
+
   /**
    * Make sure Z raise values are set
    */

Marlin/src/module/configuration_store.cpp

@@ -2354,7 +2354,12 @@ void MarlinSettings::reset() {
   #if HAS_BED_PROBE
     constexpr float dpo[XYZ] = NOZZLE_TO_PROBE_OFFSET;
     static_assert(COUNT(dpo) == 3, "NOZZLE_TO_PROBE_OFFSET must contain offsets for X, Y, and Z.");
-    LOOP_XYZ(a) probe_offset[a] = dpo[a];
+    #if HAS_PROBE_XY_OFFSET
+      LOOP_XYZ(a) probe_offset[a] = dpo[a];
+    #else
+      probe_offset.x = probe_offset.y = 0;
+      probe_offset.z = dpo[Z_AXIS];
+    #endif
   #endif
 
   //
@@ -3102,9 +3107,16 @@ void MarlinSettings::reset() {
         say_units(true);
       }
       CONFIG_ECHO_START();
-      SERIAL_ECHOLNPAIR_P(PSTR("  M851 X"), LINEAR_UNIT(probe_offset.x),
-                                  SP_Y_STR, LINEAR_UNIT(probe_offset.y),
-                                  SP_Z_STR, LINEAR_UNIT(probe_offset.z));
+      SERIAL_ECHOLNPAIR_P(
+        #if HAS_PROBE_XY_OFFSET
+          PSTR("  M851 X"), LINEAR_UNIT(probe_offset_xy.x),
+                  SP_Y_STR, LINEAR_UNIT(probe_offset_xy.y),
+                  SP_Z_STR
+        #else
+          PSTR("  M851 X0 Y0 Z")
+        #endif
+        , LINEAR_UNIT(probe_offset.z)
+      );
     #endif
 
     /**

Marlin/src/module/delta.cpp

@@ -91,13 +91,7 @@ void recalc_delta_settings() {
 #endif
 
 float delta_calibration_radius() {
-  return FLOOR((DELTA_PRINTABLE_RADIUS - (
-    #if HAS_BED_PROBE
-      _MAX(HYPOT(probe_offset.x, probe_offset.y), MIN_PROBE_EDGE)
-    #else
-      MIN_PROBE_EDGE
-    #endif
-  )) * calibration_radius_factor);
+  return FLOOR((DELTA_PRINTABLE_RADIUS - _MAX(HYPOT(probe_offset_xy.x, probe_offset_xy.y), MIN_PROBE_EDGE)) * calibration_radius_factor);
 }
 
 /**