diff --git a/Marlin/Configuration.h b/Marlin/Configuration.h
index f333c3369..93a60394c 100644
--- a/Marlin/Configuration.h
+++ b/Marlin/Configuration.h
@@ -160,11 +160,11 @@
  * Multi-Material Unit
  * Set to one of these predefined models:
  *
- *   PRUSA_MMU1      : Průša MMU1 (The "multiplexer" version)
- *   PRUSA_MMU2      : Průša MMU2
- *   PRUSA_MMU2S     : Průša MMU2S (Requires MK3S extruder with motion sensor, EXTRUDERS = 5)
- *   SMUFF_EMU_MMU2  : Technik Gegg SMuFF (Průša MMU2 emulation mode)
- *   SMUFF_EMU_MMU2S : Technik Gegg SMuFF (Průša MMU2S emulation mode)
+ *   PRUSA_MMU1           : Průša MMU1 (The "multiplexer" version)
+ *   PRUSA_MMU2           : Průša MMU2
+ *   PRUSA_MMU2S          : Průša MMU2S (Requires MK3S extruder with motion sensor, EXTRUDERS = 5)
+ *   EXTENDABLE_EMU_MMU2  : MMU with configurable number of filaments (ERCF, SMuFF or similar with Průša MMU2 compatible firmware)
+ *   EXTENDABLE_EMU_MMU2S : MMUS with configurable number of filaments (ERCF, SMuFF or similar with Průša MMU2 compatible firmware)
  *
  * Requires NOZZLE_PARK_FEATURE to park print head in case MMU unit fails.
  * See additional options in Configuration_adv.h.
diff --git a/Marlin/src/gcode/control/T.cpp b/Marlin/src/gcode/control/T.cpp
index 3ce284f82..6a084d83a 100644
--- a/Marlin/src/gcode/control/T.cpp
+++ b/Marlin/src/gcode/control/T.cpp
@@ -40,7 +40,7 @@
  *   F[units/min] Set the movement feedrate
  *   S1           Don't move the tool in XY after change
  *
- * For PRUSA_MMU2(S) and SMUFF_EMU_MMU2(S)
+ * For PRUSA_MMU2(S) and EXTENDABLE_EMU_MMU2(S)
  *   T[n] Gcode to extrude at least 38.10 mm at feedrate 19.02 mm/s must follow immediately to load to extruder wheels.
  *   T?   Gcode to extrude shouldn't have to follow. Load to extruder wheels is done automatically.
  *   Tx   Same as T?, but nozzle doesn't have to be preheated. Tc requires a preheated nozzle to finish filament load.
diff --git a/Marlin/src/inc/Conditionals_LCD.h b/Marlin/src/inc/Conditionals_LCD.h
index af902481f..a0fced150 100644
--- a/Marlin/src/inc/Conditionals_LCD.h
+++ b/Marlin/src/inc/Conditionals_LCD.h
@@ -501,11 +501,11 @@
 /**
  *  Multi-Material-Unit supported models
  */
-#define PRUSA_MMU1      1
-#define PRUSA_MMU2      2
-#define PRUSA_MMU2S     3
-#define SMUFF_EMU_MMU2  12
-#define SMUFF_EMU_MMU2S 13
+#define PRUSA_MMU1             1
+#define PRUSA_MMU2             2
+#define PRUSA_MMU2S            3
+#define EXTENDABLE_EMU_MMU2   12
+#define EXTENDABLE_EMU_MMU2S  13
 
 #ifdef MMU_MODEL
   #define HAS_MMU 1
@@ -517,16 +517,16 @@
     #define HAS_PRUSA_MMU2 1
     #define HAS_PRUSA_MMU2S 1
   #endif
-  #if MMU_MODEL == SMUFF_EMU_MMU2 || MMU_MODEL == SMUFF_EMU_MMU2S
-    #define HAS_SMUFF 1
+  #if MMU_MODEL == EXTENDABLE_EMU_MMU2 || MMU_MODEL == EXTENDABLE_EMU_MMU2S
+    #define HAS_EXTENDABLE_MMU 1
   #endif
 #endif
 
 #undef PRUSA_MMU1
 #undef PRUSA_MMU2
 #undef PRUSA_MMU2S
-#undef SMUFF_EMU_MMU2
-#undef SMUFF_EMU_MMU2S
+#undef EXTENDABLE_EMU_MMU2
+#undef EXTENDABLE_EMU_MMU2S
 
 /**
  * Extruders have some combination of stepper motors and hotends
@@ -579,7 +579,7 @@
   #undef DISABLE_INACTIVE_EXTRUDER
 #endif
 
-// Průša MMU1, MMU 2.0, MMUS 2.0 and SMuFF force SINGLENOZZLE
+// Průša MMU1, MMU(S) 2.0 and EXTENDABLE_EMU_MMU2(S) force SINGLENOZZLE
 #if HAS_MMU
   #define SINGLENOZZLE
 #endif
diff --git a/Marlin/src/inc/SanityCheck.h b/Marlin/src/inc/SanityCheck.h
index 6ed0f5324..287f0c560 100644
--- a/Marlin/src/inc/SanityCheck.h
+++ b/Marlin/src/inc/SanityCheck.h
@@ -920,10 +920,14 @@ static_assert(Y_MAX_LENGTH >= Y_BED_SIZE, "Movement bounds (Y_MIN_POS, Y_MAX_POS
   #error "PRUSA_MMU2 is obsolete. Define MMU_MODEL as PRUSA_MMU2 instead."
 #elif ENABLED(PRUSA_MMU2_S_MODE)
   #error "PRUSA_MMU2_S_MODE is obsolete. Define MMU_MODEL as PRUSA_MMU2S instead."
+#elif ENABLED(SMUFF_EMU_MMU2)
+  #error "SMUFF_EMU_MMU2 is obsolete. Define MMU_MODEL as EXTENDABLE_EMU_MMU2 instead."
+#elif ENABLED(SMUFF_EMU_MMU2S)
+  #error "SMUFF_EMU_MMU2S is obsolete. Define MMU_MODEL as EXTENDABLE_EMU_MMU2S instead."
 #endif
 
 /**
- * Multi-Material-Unit 2 / SMuFF requirements
+ * Multi-Material-Unit 2 / EXTENDABLE_EMU_MMU2 requirements
  */
 #if HAS_PRUSA_MMU2
   #if EXTRUDERS != 5
@@ -938,11 +942,11 @@ static_assert(Y_MAX_LENGTH >= Y_BED_SIZE, "Movement bounds (Y_MIN_POS, Y_MAX_POS
   #elif ENABLED(MMU_EXTRUDER_SENSOR) && !HAS_LCD_MENU
     #error "MMU_EXTRUDER_SENSOR requires an LCD supporting MarlinUI to be enabled."
   #elif DISABLED(ADVANCED_PAUSE_FEATURE)
-    static_assert(nullptr == strstr(MMU2_FILAMENT_RUNOUT_SCRIPT, "M600"), "ADVANCED_PAUSE_FEATURE is required to use M600 with PRUSA_MMU2(S) / SMUFF_EMU_MMU2(S).");
+    static_assert(nullptr == strstr(MMU2_FILAMENT_RUNOUT_SCRIPT, "M600"), "ADVANCED_PAUSE_FEATURE is required to use M600 with PRUSA_MMU2(S) / HAS_EXTENDABLE_MMU(S).");
   #endif
 #endif
-#if HAS_SMUFF && EXTRUDERS > 12
-  #error "Too many extruders for SMUFF_EMU_MMU2(S). (12 maximum)."
+#if HAS_EXTENDABLE_MMU && EXTRUDERS > 15
+  #error "Too many extruders for MMU(S) emulation mode. (15 maximum)."
 #endif
 
 /**
@@ -980,7 +984,7 @@ static_assert(Y_MAX_LENGTH >= Y_BED_SIZE, "Movement bounds (Y_MIN_POS, Y_MAX_POS
     #error "TOOLCHANGE_ZRAISE required for EXTRUDERS > 1."
   #endif
 
-#elif HAS_PRUSA_MMU1 || HAS_SMUFF
+#elif HAS_PRUSA_MMU1 || HAS_EXTENDABLE_MMU
 
   #error "Multi-Material-Unit requires 2 or more EXTRUDERS."
 
diff --git a/Marlin/src/pins/pins.h b/Marlin/src/pins/pins.h
index 8eecce2c1..35bfb266e 100644
--- a/Marlin/src/pins/pins.h
+++ b/Marlin/src/pins/pins.h
@@ -35,8 +35,8 @@
  *    These numbers are the same in any pin mapping.
  */
 
-#if HAS_SMUFF
-  #define MAX_EXTRUDERS 12
+#if HAS_EXTENDABLE_MMU
+  #define MAX_EXTRUDERS 15
 #else
   #define MAX_EXTRUDERS 8
 #endif