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diff --git a/Marlin/src/gcode/config/M301.cpp b/Marlin/src/gcode/config/M301.cpp
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+++ b/Marlin/src/gcode/config/M301.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 "../../inc/MarlinConfig.h"
+
+#if ENABLED(PIDTEMP)
+
+#include "../gcode.h"
+#include "../../module/temperature.h"
+
+/**
+ * M301: Set PID parameters P I D (and optionally C, L)
+ *
+ *   E[extruder] Default: 0
+ *
+ *   P[float] Kp term
+ *   I[float] Ki term (unscaled)
+ *   D[float] Kd term (unscaled)
+ *
+ * With PID_EXTRUSION_SCALING:
+ *
+ *   C[float] Kc term
+ *   L[int] LPQ length
+ *
+ * With PID_FAN_SCALING:
+ *
+ *   F[float] Kf term
+ */
+void GcodeSuite::M301() {
+
+  // multi-extruder PID patch: M301 updates or prints a single extruder's PID values
+  // default behavior (omitting E parameter) is to update for extruder 0 only
+  const uint8_t e = parser.byteval('E'); // extruder being updated
+
+  if (e < HOTENDS) { // catch bad input value
+    if (parser.seen('P')) PID_PARAM(Kp, e) = parser.value_float();
+    if (parser.seen('I')) PID_PARAM(Ki, e) = scalePID_i(parser.value_float());
+    if (parser.seen('D')) PID_PARAM(Kd, e) = scalePID_d(parser.value_float());
+    #if ENABLED(PID_EXTRUSION_SCALING)
+      if (parser.seen('C')) PID_PARAM(Kc, e) = parser.value_float();
+      if (parser.seenval('L')) thermalManager.lpq_len = parser.value_int();
+      NOMORE(thermalManager.lpq_len, LPQ_MAX_LEN);
+      NOLESS(thermalManager.lpq_len, 0);
+    #endif
+
+    #if ENABLED(PID_FAN_SCALING)
+      if (parser.seen('F')) PID_PARAM(Kf, e) = parser.value_float();
+    #endif
+
+    thermalManager.updatePID();
+
+    SERIAL_ECHO_START();
+    #if ENABLED(PID_PARAMS_PER_HOTEND)
+      SERIAL_ECHOPAIR(" e:", e); // specify extruder in serial output
+    #endif
+    SERIAL_ECHOPAIR(" p:", PID_PARAM(Kp, e),
+                    " i:", unscalePID_i(PID_PARAM(Ki, e)),
+                    " d:", unscalePID_d(PID_PARAM(Kd, e)));
+    #if ENABLED(PID_EXTRUSION_SCALING)
+      SERIAL_ECHOPAIR(" c:", PID_PARAM(Kc, e));
+    #endif
+    #if ENABLED(PID_FAN_SCALING)
+      SERIAL_ECHOPAIR(" f:", PID_PARAM(Kf, e));
+    #endif
+
+    SERIAL_EOL();
+  }
+  else
+    SERIAL_ERROR_MSG(STR_INVALID_EXTRUDER);
+}
+
+#endif // PIDTEMP