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diff --git a/Marlin/src/gcode/config/M220.cpp b/Marlin/src/gcode/config/M220.cpp
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+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "../gcode.h"
+#include "../../module/motion.h"
+
+/**
+ * M220: Set speed percentage factor, aka "Feed Rate"
+ *
+ * Parameters
+ *   S<percent> : Set the feed rate percentage factor
+ *
+ * Report the current speed percentage factor if no parameter is specified
+ *
+ * For MMU2 and MMU2S devices...
+ *   B : Flag to back up the current factor
+ *   R : Flag to restore the last-saved factor
+ */
+void GcodeSuite::M220() {
+
+  static int16_t backup_feedrate_percentage = 100;
+  if (parser.seen('B')) backup_feedrate_percentage = feedrate_percentage;
+  if (parser.seen('R')) feedrate_percentage = backup_feedrate_percentage;
+
+  if (parser.seenval('S')) feedrate_percentage = parser.value_int();
+
+  if (!parser.seen_any()) {
+    SERIAL_ECHOPAIR("FR:", feedrate_percentage);
+    SERIAL_CHAR('%');
+    SERIAL_EOL();
+  }
+}