Added DISABLE_MAX_ENDSTOPS

Marlin/Configuration.h

 const bool X_ENDSTOPS_INVERTING = true; // set to true to invert the logic of the endstops. 
 const bool Y_ENDSTOPS_INVERTING = true; // set to true to invert the logic of the endstops. 
 const bool Z_ENDSTOPS_INVERTING = true; // set to true to invert the logic of the endstops. 
+#define DISABLE_MAX_ENDSTOPS
 
 // For Inverting Stepper Enable Pins (Active Low) use 0, Non Inverting (Active High) use 1
 #define X_ENABLE_ON 0

Marlin/pins.h

   #define _E2_PINS
 #endif
 
+#ifdef DISABLE_MAX_ENDSTOPS
+#define X_MAX_PIN          -1
+#define Y_MAX_PIN          -1
+#define Z_MAX_PIN          -1
+#endif
+
 #define SENSITIVE_PINS {0, 1, X_STEP_PIN, X_DIR_PIN, X_ENABLE_PIN, X_MIN_PIN, X_MAX_PIN, Y_STEP_PIN, Y_DIR_PIN, Y_ENABLE_PIN, Y_MIN_PIN, Y_MAX_PIN, Z_STEP_PIN, Z_DIR_PIN, Z_ENABLE_PIN, Z_MIN_PIN, Z_MAX_PIN, LED_PIN, PS_ON_PIN, \
                         HEATER_BED_PIN, FAN_PIN,                  \
                         _E0_PINS _E1_PINS _E2_PINS             \