Allow override of probe bounds

Marlin/src/inc/Conditionals_post.h

@@ -957,22 +957,36 @@
   // Probing points may be verified at compile time within the radius
   // using static_assert(HYPOT2(X2-X1,Y2-Y1)<=sq(DELTA_PRINTABLE_RADIUS),"bad probe point!")
   // so that may be added to SanityCheck.h in the future.
-  #define MIN_PROBE_X (X_CENTER - DELTA_PRINTABLE_RADIUS)
-  #define MIN_PROBE_Y (Y_CENTER - DELTA_PRINTABLE_RADIUS)
-  #define MAX_PROBE_X (X_CENTER + DELTA_PRINTABLE_RADIUS)
-  #define MAX_PROBE_Y (Y_CENTER + DELTA_PRINTABLE_RADIUS)
+  #define _MIN_PROBE_X (X_CENTER - DELTA_PRINTABLE_RADIUS)
+  #define _MIN_PROBE_Y (Y_CENTER - DELTA_PRINTABLE_RADIUS)
+  #define _MAX_PROBE_X (X_CENTER + DELTA_PRINTABLE_RADIUS)
+  #define _MAX_PROBE_Y (Y_CENTER + DELTA_PRINTABLE_RADIUS)
 #elif IS_SCARA
   #define SCARA_PRINTABLE_RADIUS (SCARA_LINKAGE_1 + SCARA_LINKAGE_2)
-  #define MIN_PROBE_X (X_CENTER - (SCARA_PRINTABLE_RADIUS))
-  #define MIN_PROBE_Y (Y_CENTER - (SCARA_PRINTABLE_RADIUS))
-  #define MAX_PROBE_X (X_CENTER +  SCARA_PRINTABLE_RADIUS)
-  #define MAX_PROBE_Y (Y_CENTER +  SCARA_PRINTABLE_RADIUS)
+  #define _MIN_PROBE_X (X_CENTER - (SCARA_PRINTABLE_RADIUS))
+  #define _MIN_PROBE_Y (Y_CENTER - (SCARA_PRINTABLE_RADIUS))
+  #define _MAX_PROBE_X (X_CENTER +  SCARA_PRINTABLE_RADIUS)
+  #define _MAX_PROBE_Y (Y_CENTER +  SCARA_PRINTABLE_RADIUS)
 #else
   // Boundaries for Cartesian probing based on bed limits
-  #define MIN_PROBE_X (max(X_MIN_BED, X_MIN_POS + X_PROBE_OFFSET_FROM_EXTRUDER))
-  #define MIN_PROBE_Y (max(Y_MIN_BED, Y_MIN_POS + Y_PROBE_OFFSET_FROM_EXTRUDER))
-  #define MAX_PROBE_X (min(X_MAX_BED, X_MAX_POS + X_PROBE_OFFSET_FROM_EXTRUDER))
-  #define MAX_PROBE_Y (min(Y_MAX_BED, Y_MAX_POS + Y_PROBE_OFFSET_FROM_EXTRUDER))
+  #define _MIN_PROBE_X (max(X_MIN_BED, X_MIN_POS + X_PROBE_OFFSET_FROM_EXTRUDER))
+  #define _MIN_PROBE_Y (max(Y_MIN_BED, Y_MIN_POS + Y_PROBE_OFFSET_FROM_EXTRUDER))
+  #define _MAX_PROBE_X (min(X_MAX_BED, X_MAX_POS + X_PROBE_OFFSET_FROM_EXTRUDER))
+  #define _MAX_PROBE_Y (min(Y_MAX_BED, Y_MAX_POS + Y_PROBE_OFFSET_FROM_EXTRUDER))
+#endif
+
+// Allow configuration to override these for special purposes
+#ifndef MIN_PROBE_X
+  #define MIN_PROBE_X _MIN_PROBE_X
+#endif
+#ifndef MIN_PROBE_Y
+  #define MIN_PROBE_Y _MIN_PROBE_Y
+#endif
+#ifndef MAX_PROBE_X
+  #define MAX_PROBE_X _MAX_PROBE_X
+#endif
+#ifndef MAX_PROBE_Y
+  #define MAX_PROBE_Y _MAX_PROBE_Y
 #endif
 
 /**