Add bed calibration points macro definitions to MK25 variants.

Homing and full print area printing tested on MK25.

Firmware/variants/1_75mm_MK25-RAMBo10a-E3Dv6full.h

@@ -75,6 +75,15 @@ const bool Z_MIN_ENDSTOP_INVERTING = false; // set to true to invert the logic o
 #define NUM_AXIS 4 // The axis order in all axis related arrays is X, Y, Z, E
 #define HOMING_FEEDRATE {3000, 3000, 800, 0}  // set the homing speeds (mm/min) // 3000 is also valid for stallGuard homing. Valid range: 2200 - 3000
 
+/**
+ * [0,0] steel sheet print area point X coordinate in bed print area coordinates
+ */
+#define SHEET_PRINT_ZERO_REF_X 0.f
+/**
+ * [0,0] steel sheet print area point Y coordinate in bed print area coordinates
+ */
+#define SHEET_PRINT_ZERO_REF_Y 0.f
+
 #define DEFAULT_MAX_FEEDRATE          {200, 200, 12, 120}      // (mm/sec)   max feedrate (M203)
 #define DEFAULT_MAX_ACCELERATION      {1000, 1000, 200, 5000}  // (mm/sec^2) max acceleration (M201)
 

Firmware/variants/1_75mm_MK25-RAMBo13a-E3Dv6full.h

@@ -75,6 +75,15 @@ const bool Z_MIN_ENDSTOP_INVERTING = false; // set to true to invert the logic o
 #define NUM_AXIS 4 // The axis order in all axis related arrays is X, Y, Z, E
 #define HOMING_FEEDRATE {3000, 3000, 800, 0}  // set the homing speeds (mm/min) // 3000 is also valid for stallGuard homing. Valid range: 2200 - 3000
 
+/**
+ * [0,0] steel sheet print area point X coordinate in bed print area coordinates
+ */
+#define SHEET_PRINT_ZERO_REF_X 0.f
+/**
+ * [0,0] steel sheet print area point Y coordinate in bed print area coordinates
+ */
+#define SHEET_PRINT_ZERO_REF_Y 0.f
+
 #define DEFAULT_MAX_FEEDRATE          {200, 200, 12, 120}      // (mm/sec)   max feedrate (M203)
 #define DEFAULT_MAX_ACCELERATION      {1000, 1000, 200, 5000}  // (mm/sec^2) max acceleration (M201)