diff --git a/Marlin/src/pins/pins.h b/Marlin/src/pins/pins.h
index 4f3397b98d..3f5cb4d018 100644
--- a/Marlin/src/pins/pins.h
+++ b/Marlin/src/pins/pins.h
@@ -35,7 +35,12 @@
  *    These numbers are the same in any pin mapping.
  */
 
-#define MAX_EXTRUDERS 8
+#if HAS_SMUFF
+  #define MAX_EXTRUDERS 15
+#else
+  #define MAX_EXTRUDERS 8
+#endif
+#define MAX_E_STEPPERS 8
 
 #if   MB(RAMPS_13_EFB, RAMPS_14_EFB, RAMPS_PLUS_EFB, RAMPS_14_RE_ARM_EFB, RAMPS_SMART_EFB, RAMPS_DUO_EFB, RAMPS4DUE_EFB)
   #define IS_RAMPS_EFB
diff --git a/Marlin/src/pins/pins_postprocess.h b/Marlin/src/pins/pins_postprocess.h
index fdf9f095cb..26c271b1a6 100644
--- a/Marlin/src/pins/pins_postprocess.h
+++ b/Marlin/src/pins/pins_postprocess.h
@@ -521,7 +521,7 @@
     #define X2_STEP_PIN   _EPIN(X2_E_INDEX, STEP)
     #define X2_DIR_PIN    _EPIN(X2_E_INDEX, DIR)
     #define X2_ENABLE_PIN _EPIN(X2_E_INDEX, ENABLE)
-    #if X2_E_INDEX >= MAX_EXTRUDERS || !PIN_EXISTS(X2_STEP)
+    #if X2_E_INDEX >= MAX_E_STEPPERS || !PIN_EXISTS(X2_STEP)
       #error "No E stepper plug left for X2!"
     #endif
   #endif
@@ -594,7 +594,7 @@
     #define Y2_STEP_PIN   _EPIN(Y2_E_INDEX, STEP)
     #define Y2_DIR_PIN    _EPIN(Y2_E_INDEX, DIR)
     #define Y2_ENABLE_PIN _EPIN(Y2_E_INDEX, ENABLE)
-    #if Y2_E_INDEX >= MAX_EXTRUDERS || !PIN_EXISTS(Y2_STEP)
+    #if Y2_E_INDEX >= MAX_E_STEPPERS || !PIN_EXISTS(Y2_STEP)
       #error "No E stepper plug left for Y2!"
     #endif
   #endif
@@ -662,7 +662,7 @@
     #define Z2_STEP_PIN   _EPIN(Z2_E_INDEX, STEP)
     #define Z2_DIR_PIN    _EPIN(Z2_E_INDEX, DIR)
     #define Z2_ENABLE_PIN _EPIN(Z2_E_INDEX, ENABLE)
-    #if Z2_E_INDEX >= MAX_EXTRUDERS || !PIN_EXISTS(Z2_STEP)
+    #if Z2_E_INDEX >= MAX_E_STEPPERS || !PIN_EXISTS(Z2_STEP)
       #error "No E stepper plug left for Z2!"
     #endif
   #endif
@@ -729,7 +729,7 @@
     #define Z3_STEP_PIN   _EPIN(Z3_E_INDEX, STEP)
     #define Z3_DIR_PIN    _EPIN(Z3_E_INDEX, DIR)
     #define Z3_ENABLE_PIN _EPIN(Z3_E_INDEX, ENABLE)
-    #if Z3_E_INDEX >= MAX_EXTRUDERS || !PIN_EXISTS(Z3_STEP)
+    #if Z3_E_INDEX >= MAX_E_STEPPERS || !PIN_EXISTS(Z3_STEP)
       #error "No E stepper plug left for Z3!"
     #endif
   #endif
@@ -796,7 +796,7 @@
     #define Z4_STEP_PIN   _EPIN(Z4_E_INDEX, STEP)
     #define Z4_DIR_PIN    _EPIN(Z4_E_INDEX, DIR)
     #define Z4_ENABLE_PIN _EPIN(Z4_E_INDEX, ENABLE)
-    #if Z4_E_INDEX >= MAX_EXTRUDERS || !PIN_EXISTS(Z4_STEP)
+    #if Z4_E_INDEX >= MAX_E_STEPPERS || !PIN_EXISTS(Z4_STEP)
       #error "No E stepper plug left for Z4!"
     #endif
   #endif
diff --git a/Marlin/src/pins/stm32f4/pins_BTT_GTR_V1_0.h b/Marlin/src/pins/stm32f4/pins_BTT_GTR_V1_0.h
index eaf90da1ae..eb1e886fa4 100644
--- a/Marlin/src/pins/stm32f4/pins_BTT_GTR_V1_0.h
+++ b/Marlin/src/pins/stm32f4/pins_BTT_GTR_V1_0.h
@@ -25,8 +25,8 @@
   #error "Oops! Select an STM32F4 board in 'Tools > Board.'"
 #elif HOTENDS > 8 || E_STEPPERS > 8
   #error "BIGTREE GTR V1.0 supports up to 8 hotends / E-steppers."
-#elif HOTENDS > MAX_EXTRUDERS || E_STEPPERS > MAX_EXTRUDERS
-  #error "Marlin extruder/hotends limit! Increase MAX_EXTRUDERS to continue."
+#elif HOTENDS > MAX_E_STEPPERS || E_STEPPERS > MAX_E_STEPPERS
+  #error "Marlin extruder/hotends limit! Increase MAX_E_STEPPERS to continue."
 #endif
 
 #define BOARD_INFO_NAME "BTT GTR V1.0"