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diff --git a/Marlin/src/gcode/temp/M141_M191.cpp b/Marlin/src/gcode/temp/M141_M191.cpp
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+++ b/Marlin/src/gcode/temp/M141_M191.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/>.
+ *
+ */
+
+/**
+ * gcode/temp/M141_M191.cpp
+ *
+ * Chamber target temperature control
+ */
+
+#include "../../inc/MarlinConfig.h"
+
+#if HAS_HEATED_CHAMBER
+
+#include "../gcode.h"
+#include "../../module/temperature.h"
+
+#include "../../module/motion.h"
+#include "../../lcd/marlinui.h"
+
+#if ENABLED(PRINTJOB_TIMER_AUTOSTART)
+  #include "../../module/printcounter.h"
+#endif
+
+#if ENABLED(PRINTER_EVENT_LEDS)
+  #include "../../feature/leds/leds.h"
+#endif
+
+#include "../../MarlinCore.h" // for wait_for_heatup, idle, startOrResumeJob
+
+/**
+ * M141: Set chamber temperature
+ */
+void GcodeSuite::M141() {
+  if (DEBUGGING(DRYRUN)) return;
+  if (parser.seenval('S')) {
+    thermalManager.setTargetChamber(parser.value_celsius());
+
+    #if ENABLED(PRINTJOB_TIMER_AUTOSTART)
+      /**
+       * Stop the timer at the end of print. Hotend, bed target, and chamber
+       * temperatures need to be set below mintemp. Order of M140, M104, and M141
+       * at the end of the print does not matter.
+       */
+      thermalManager.auto_job_check_timer(false, true);
+    #endif
+  }
+}
+
+/**
+ * M191: Sxxx Wait for chamber current temp to reach target temp. Waits only when heating
+ *       Rxxx Wait for chamber current temp to reach target temp. Waits when heating and cooling
+ */
+void GcodeSuite::M191() {
+  if (DEBUGGING(DRYRUN)) return;
+
+  const bool no_wait_for_cooling = parser.seenval('S');
+  if (no_wait_for_cooling || parser.seenval('R')) {
+    thermalManager.setTargetChamber(parser.value_celsius());
+    TERN_(PRINTJOB_TIMER_AUTOSTART, thermalManager.auto_job_check_timer(true, false));
+  }
+  else return;
+
+  const bool is_heating = thermalManager.isHeatingChamber();
+  if (is_heating || !no_wait_for_cooling) {
+    ui.set_status_P(is_heating ? GET_TEXT(MSG_CHAMBER_HEATING) : GET_TEXT(MSG_CHAMBER_COOLING));
+    thermalManager.wait_for_chamber(false);
+  }
+}
+
+#endif // HAS_HEATED_CHAMBER