diff --git a/Marlin/src/module/stepper_indirection.h b/Marlin/src/module/stepper_indirection.h
index 3342337340..06882aa0a8 100644
--- a/Marlin/src/module/stepper_indirection.h
+++ b/Marlin/src/module/stepper_indirection.h
@@ -451,44 +451,48 @@ void reset_stepper_drivers();    // Called by settings.load / settings.reset
  * Extruder indirection for the single E axis
  */
 #if ENABLED(SWITCHING_EXTRUDER)
-  #if EXTRUDERS == 2
-    #define E_STEP_WRITE(v) E0_STEP_WRITE(v)
-    #define NORM_E_DIR() do{ E0_DIR_WRITE(current_block->active_extruder ?  INVERT_E0_DIR : !INVERT_E0_DIR); }while(0)
-    #define  REV_E_DIR() do{ E0_DIR_WRITE(current_block->active_extruder ? !INVERT_E0_DIR :  INVERT_E0_DIR); }while(0)
-  #elif EXTRUDERS > 4
+  #if EXTRUDERS > 4
     #define E_STEP_WRITE(v) do{ if (current_block->active_extruder < 2) { E0_STEP_WRITE(v); } else if (current_block->active_extruder < 4) { E1_STEP_WRITE(v); } else { E2_STEP_WRITE(v); } }while(0)
-    #define NORM_E_DIR() do{ switch (current_block->active_extruder) { case 0: E0_DIR_WRITE(!INVERT_E0_DIR); break; case 1: E0_DIR_WRITE(INVERT_E0_DIR); break; case 2: E1_DIR_WRITE(!INVERT_E1_DIR); break; case 3: E1_DIR_WRITE(INVERT_E1_DIR); break; case 4: E2_DIR_WRITE(!INVERT_E2_DIR); } }while(0)
-    #define REV_E_DIR() do{ switch (current_block->active_extruder) { case 0: E0_DIR_WRITE(INVERT_E0_DIR); break; case 1: E0_DIR_WRITE(!INVERT_E0_DIR); break; case 2: E1_DIR_WRITE(INVERT_E1_DIR); break; case 3: E1_DIR_WRITE(!INVERT_E1_DIR); break; case 4: E2_DIR_WRITE(INVERT_E2_DIR); } }while(0)
+    #define NORM_E_DIR() do{ switch (current_block->active_extruder) { case 0: E0_DIR_WRITE(!INVERT_E0_DIR); break; case 1: E0_DIR_WRITE( INVERT_E0_DIR); break; case 2: E1_DIR_WRITE(!INVERT_E1_DIR); break; case 3: E1_DIR_WRITE( INVERT_E1_DIR); break; case 4: E2_DIR_WRITE(!INVERT_E2_DIR); } }while(0)
+    #define REV_E_DIR()  do{ switch (current_block->active_extruder) { case 0: E0_DIR_WRITE( INVERT_E0_DIR); break; case 1: E0_DIR_WRITE(!INVERT_E0_DIR); break; case 2: E1_DIR_WRITE( INVERT_E1_DIR); break; case 3: E1_DIR_WRITE(!INVERT_E1_DIR); break; case 4: E2_DIR_WRITE( INVERT_E2_DIR); } }while(0)
+  #elif EXTRUDERS > 3
+    #define E_STEP_WRITE(v) do{ if (current_block->active_extruder < 2) { E0_STEP_WRITE(v); } else { E1_STEP_WRITE(v); } }while(0)
+    #define NORM_E_DIR() do{ switch (current_block->active_extruder) { case 0: E0_DIR_WRITE(!INVERT_E0_DIR); break; case 1: E0_DIR_WRITE( INVERT_E0_DIR); break; case 2: E1_DIR_WRITE(!INVERT_E1_DIR); break; case 3: E1_DIR_WRITE( INVERT_E1_DIR); } }while(0)
+    #define REV_E_DIR()  do{ switch (current_block->active_extruder) { case 0: E0_DIR_WRITE( INVERT_E0_DIR); break; case 1: E0_DIR_WRITE(!INVERT_E0_DIR); break; case 2: E1_DIR_WRITE( INVERT_E1_DIR); break; case 3: E1_DIR_WRITE(!INVERT_E1_DIR); } }while(0)
   #elif EXTRUDERS > 2
-    #define E_STEP_WRITE(v) do{ if (current_block->active_extruder < 2) { E0_STEP_WRITE(v); } else if (current_block->active_extruder < 4) { E1_STEP_WRITE(v); } else { E1_STEP_WRITE(v); } }while(0)
-    #define NORM_E_DIR() do{ switch (current_block->active_extruder) { case 0: E0_DIR_WRITE(!INVERT_E0_DIR); break; case 1: E0_DIR_WRITE(INVERT_E0_DIR); break; case 2: E1_DIR_WRITE(!INVERT_E1_DIR); break; case 3: E1_DIR_WRITE(INVERT_E1_DIR); } }while(0)
-    #define REV_E_DIR() do{ switch (current_block->active_extruder) { case 0: E0_DIR_WRITE(INVERT_E0_DIR); break; case 1: E0_DIR_WRITE(!INVERT_E0_DIR); break; case 2: E1_DIR_WRITE(INVERT_E1_DIR); break; case 3: E1_DIR_WRITE(!INVERT_E1_DIR); } }while(0)
+    #define E_STEP_WRITE(v) do{ if (current_block->active_extruder < 2) { E0_STEP_WRITE(v); } else { E1_STEP_WRITE(v); } }while(0)
+    #define NORM_E_DIR() do{ switch (current_block->active_extruder) { case 0: E0_DIR_WRITE(!INVERT_E0_DIR); break; case 1: E0_DIR_WRITE( INVERT_E0_DIR); break; case 2: E1_DIR_WRITE(!INVERT_E1_DIR); } }while(0)
+    #define REV_E_DIR()  do{ switch (current_block->active_extruder) { case 0: E0_DIR_WRITE( INVERT_E0_DIR); break; case 1: E0_DIR_WRITE(!INVERT_E0_DIR); break; case 2: E1_DIR_WRITE( INVERT_E1_DIR); } }while(0)
+  #else
+    #define E_STEP_WRITE(v) E0_STEP_WRITE(v)
+    #define NORM_E_DIR() do{ E0_DIR_WRITE(current_block->active_extruder ?  INVERT_E0_DIR : !INVERT_E0_DIR); }while(0)
+    #define REV_E_DIR()  do{ E0_DIR_WRITE(current_block->active_extruder ? !INVERT_E0_DIR :  INVERT_E0_DIR); }while(0)
   #endif
 #elif ENABLED(MK2_MULTIPLEXER) // Even-numbered steppers are reversed
   #define E_STEP_WRITE(v) E0_STEP_WRITE(v)
   #define NORM_E_DIR() do{ E0_DIR_WRITE(TEST(current_block->active_extruder, 0) ? !INVERT_E0_DIR: INVERT_E0_DIR); }while(0)
-  #define REV_E_DIR() do{ E0_DIR_WRITE(TEST(current_block->active_extruder, 0) ? INVERT_E0_DIR: !INVERT_E0_DIR); }while(0)
+  #define REV_E_DIR()  do{ E0_DIR_WRITE(TEST(current_block->active_extruder, 0) ? INVERT_E0_DIR: !INVERT_E0_DIR); }while(0)
 #elif EXTRUDERS > 4
   #define E_STEP_WRITE(v) do{ switch (current_block->active_extruder) { case 0: E0_STEP_WRITE(v); break; case 1: E1_STEP_WRITE(v); break; case 2: E2_STEP_WRITE(v); break; case 3: E3_STEP_WRITE(v); break; case 4: E4_STEP_WRITE(v); } }while(0)
   #define NORM_E_DIR() do{ switch (current_block->active_extruder) { case 0: E0_DIR_WRITE(!INVERT_E0_DIR); break; case 1: E1_DIR_WRITE(!INVERT_E1_DIR); break; case 2: E2_DIR_WRITE(!INVERT_E2_DIR); break; case 3: E3_DIR_WRITE(!INVERT_E3_DIR); break; case 4: E4_DIR_WRITE(!INVERT_E4_DIR); } }while(0)
-  #define REV_E_DIR() do{ switch (current_block->active_extruder) { case 0: E0_DIR_WRITE(INVERT_E0_DIR); break; case 1: E1_DIR_WRITE(INVERT_E1_DIR); break; case 2: E2_DIR_WRITE(INVERT_E2_DIR); break; case 3: E3_DIR_WRITE(INVERT_E3_DIR); break; case 4: E4_DIR_WRITE(INVERT_E4_DIR); } }while(0)
+  #define REV_E_DIR()  do{ switch (current_block->active_extruder) { case 0: E0_DIR_WRITE( INVERT_E0_DIR); break; case 1: E1_DIR_WRITE( INVERT_E1_DIR); break; case 2: E2_DIR_WRITE( INVERT_E2_DIR); break; case 3: E3_DIR_WRITE( INVERT_E3_DIR); break; case 4: E4_DIR_WRITE( INVERT_E4_DIR); } }while(0)
 #elif EXTRUDERS > 3
   #define E_STEP_WRITE(v) do{ switch (current_block->active_extruder) { case 0: E0_STEP_WRITE(v); break; case 1: E1_STEP_WRITE(v); break; case 2: E2_STEP_WRITE(v); break; case 3: E3_STEP_WRITE(v); } }while(0)
   #define NORM_E_DIR() do{ switch (current_block->active_extruder) { case 0: E0_DIR_WRITE(!INVERT_E0_DIR); break; case 1: E1_DIR_WRITE(!INVERT_E1_DIR); break; case 2: E2_DIR_WRITE(!INVERT_E2_DIR); break; case 3: E3_DIR_WRITE(!INVERT_E3_DIR); } }while(0)
-  #define REV_E_DIR() do{ switch (current_block->active_extruder) { case 0: E0_DIR_WRITE(INVERT_E0_DIR); break; case 1: E1_DIR_WRITE(INVERT_E1_DIR); break; case 2: E2_DIR_WRITE(INVERT_E2_DIR); break; case 3: E3_DIR_WRITE(INVERT_E3_DIR); } }while(0)
+  #define REV_E_DIR()  do{ switch (current_block->active_extruder) { case 0: E0_DIR_WRITE( INVERT_E0_DIR); break; case 1: E1_DIR_WRITE( INVERT_E1_DIR); break; case 2: E2_DIR_WRITE( INVERT_E2_DIR); break; case 3: E3_DIR_WRITE( INVERT_E3_DIR); } }while(0)
 #elif EXTRUDERS > 2
   #define E_STEP_WRITE(v) do{ switch (current_block->active_extruder) { case 0: E0_STEP_WRITE(v); break; case 1: E1_STEP_WRITE(v); break; case 2: E2_STEP_WRITE(v); } }while(0)
   #define NORM_E_DIR() do{ switch (current_block->active_extruder) { case 0: E0_DIR_WRITE(!INVERT_E0_DIR); break; case 1: E1_DIR_WRITE(!INVERT_E1_DIR); break; case 2: E2_DIR_WRITE(!INVERT_E2_DIR); } }while(0)
-  #define REV_E_DIR() do{ switch (current_block->active_extruder) { case 0: E0_DIR_WRITE(INVERT_E0_DIR); break; case 1: E1_DIR_WRITE(INVERT_E1_DIR); break; case 2: E2_DIR_WRITE(INVERT_E2_DIR); } }while(0)
+  #define REV_E_DIR()  do{ switch (current_block->active_extruder) { case 0: E0_DIR_WRITE( INVERT_E0_DIR); break; case 1: E1_DIR_WRITE( INVERT_E1_DIR); break; case 2: E2_DIR_WRITE( INVERT_E2_DIR); } }while(0)
 #elif EXTRUDERS > 1
   #if ENABLED(DUAL_X_CARRIAGE) || ENABLED(DUAL_NOZZLE_DUPLICATION_MODE)
     #define E_STEP_WRITE(v) do{ if (extruder_duplication_enabled) { E0_STEP_WRITE(v); E1_STEP_WRITE(v); } else if (current_block->active_extruder == 0) { E0_STEP_WRITE(v); } else { E1_STEP_WRITE(v); } }while(0)
     #define NORM_E_DIR() do{ if (extruder_duplication_enabled) { E0_DIR_WRITE(!INVERT_E0_DIR); E1_DIR_WRITE(!INVERT_E1_DIR); } else if (current_block->active_extruder == 0) { E0_DIR_WRITE(!INVERT_E0_DIR); } else { E1_DIR_WRITE(!INVERT_E1_DIR); } }while(0)
-    #define REV_E_DIR() do{ if (extruder_duplication_enabled) { E0_DIR_WRITE(INVERT_E0_DIR); E1_DIR_WRITE(INVERT_E1_DIR); } else if (current_block->active_extruder == 0) { E0_DIR_WRITE(INVERT_E0_DIR); } else { E1_DIR_WRITE(INVERT_E1_DIR); } }while(0)
+    #define REV_E_DIR()  do{ if (extruder_duplication_enabled) { E0_DIR_WRITE( INVERT_E0_DIR); E1_DIR_WRITE( INVERT_E1_DIR); } else if (current_block->active_extruder == 0) { E0_DIR_WRITE( INVERT_E0_DIR); } else { E1_DIR_WRITE( INVERT_E1_DIR); } }while(0)
   #else
     #define E_STEP_WRITE(v) do{ if (current_block->active_extruder == 0) { E0_STEP_WRITE(v); } else { E1_STEP_WRITE(v); } }while(0)
     #define NORM_E_DIR() do{ if (current_block->active_extruder == 0) { E0_DIR_WRITE(!INVERT_E0_DIR); } else { E1_DIR_WRITE(!INVERT_E1_DIR); } }while(0)
-    #define REV_E_DIR() do{ if (current_block->active_extruder == 0) { E0_DIR_WRITE(INVERT_E0_DIR); } else { E1_DIR_WRITE(INVERT_E1_DIR); } }while(0)
+    #define REV_E_DIR()  do{ if (current_block->active_extruder == 0) { E0_DIR_WRITE( INVERT_E0_DIR); } else { E1_DIR_WRITE( INVERT_E1_DIR); } }while(0)
   #endif
 #elif ENABLED(MIXING_EXTRUDER)
   #define E_STEP_WRITE(v) NOOP /* not used for mixing extruders! */
@@ -512,7 +516,7 @@ void reset_stepper_drivers();    // Called by settings.load / settings.reset
 #else
   #define E_STEP_WRITE(v) E0_STEP_WRITE(v)
   #define NORM_E_DIR() E0_DIR_WRITE(!INVERT_E0_DIR)
-  #define REV_E_DIR() E0_DIR_WRITE(INVERT_E0_DIR)
+  #define REV_E_DIR() E0_DIR_WRITE( INVERT_E0_DIR)
 #endif
 
 #endif // STEPPER_INDIRECTION_H