Tweak Y_MIN/MAX and homing for MGN12 rails

Firmware/Configuration.h

@@ -418,7 +418,7 @@ your extruder heater takes 2 minutes to hit the target on heating.
 
 
 // The position of the homing switches
-//#define MANUAL_HOME_POSITIONS  // If defined, MANUAL_*_HOME_POS below will be used
+#define MANUAL_HOME_POSITIONS  // If defined, MANUAL_*_HOME_POS below will be used
 //#define BED_CENTER_AT_0_0  // If defined, the center of the bed is at (X=0, Y=0)
 
 //Manual homing switch locations:

Firmware/variants/1_75mm_MK3S-EINSy10a-E3Dv6full.h

@@ -60,15 +60,15 @@
 #define INVERT_E2_DIR 0   // for direct drive extruder v9 set to 1, for geared extruder set to 0
 
 // Home position
-#define MANUAL_X_HOME_POS 0
-#define MANUAL_Y_HOME_POS -2.2
-#define MANUAL_Z_HOME_POS 0.2
+#define MANUAL_X_HOME_POS 1.0
+#define MANUAL_Y_HOME_POS -8.0
+#define MANUAL_Z_HOME_POS 0.1
 
 // Travel limits after homing
 #define X_MAX_POS 247
 #define X_MIN_POS 1
-#define Y_MAX_POS 212.5
-#define Y_MIN_POS -4 //orig -4
+#define Y_MAX_POS 214
+#define Y_MIN_POS -8 //orig -4
 #define Z_MAX_POS 196
 #define Z_MIN_POS 0.10