diff --git a/dda.c b/dda.c
index 435fcdb..d3d5e56 100644
--- a/dda.c
+++ b/dda.c
@@ -112,6 +112,8 @@ void dda_init(void) {
 		startpoint.F = next_target.target.F = SEARCH_FEEDRATE_Z;
   if (startpoint.e_multiplier == 0)
     startpoint.e_multiplier = next_target.target.e_multiplier = 256;
+  if (startpoint.f_multiplier == 0)
+    startpoint.f_multiplier = next_target.target.f_multiplier = 256;
 }
 
 /*! Distribute a new startpoint to DDA's internal structures without any movement.
@@ -177,6 +179,13 @@ void dda_create(DDA *dda, const TARGET *target) {
                dda->endpoint.axis[X], dda->endpoint.axis[Y],
                dda->endpoint.axis[Z], dda->endpoint.F);
 
+  // Apply feedrate multiplier.
+  if (dda->endpoint.f_multiplier != 256) {
+    dda->endpoint.F *= dda->endpoint.f_multiplier;
+    dda->endpoint.F += 128;
+    dda->endpoint.F /= 256;
+  }
+
   #ifdef LOOKAHEAD
     // Set the start and stop speeds to zero for now = full stops between
     // moves. Also fallback if lookahead calculations fail to finish in time.
diff --git a/dda.h b/dda.h
index b4b2cdc..47e2907 100644
--- a/dda.h
+++ b/dda.h
@@ -42,6 +42,7 @@ typedef struct {
   uint32_t  F;
 
   uint16_t  e_multiplier;
+  uint16_t  f_multiplier;
   uint8_t   e_relative        :1; ///< bool: e axis relative? Overrides all_relative
 } TARGET;
 
diff --git a/gcode_process.c b/gcode_process.c
index 1cb50be..21f8f1e 100644
--- a/gcode_process.c
+++ b/gcode_process.c
@@ -793,6 +793,14 @@ void process_gcode_command() {
 				#endif
 				break;
 
+      case 220:
+        //? --- M220: Set speed factor override percentage ---
+        if ( ! next_target.seen_S)
+          break;
+        // Scale 100% = 256
+        next_target.target.f_multiplier = (next_target.S * 64 + 12) / 25;
+        break;
+
       case 221:
         //? --- M221: Control the extruders flow ---
         if ( ! next_target.seen_S)