From 4ce9ddbb74052bce8799326e03bd9f5daa081957 Mon Sep 17 00:00:00 2001
From: Scott Lahteine <sourcetree@thinkyhead.com>
Date: Mon, 15 Jun 2015 17:50:26 -0700
Subject: [PATCH] Check the temperature before filament change

---
 Marlin/Marlin_main.cpp                | 6 ++++++
 Marlin/configurator/config/language.h | 1 +
 Marlin/language.h                     | 1 +
 3 files changed, 8 insertions(+)

diff --git a/Marlin/Marlin_main.cpp b/Marlin/Marlin_main.cpp
index 24eb891151..3dae65f713 100644
--- a/Marlin/Marlin_main.cpp
+++ b/Marlin/Marlin_main.cpp
@@ -4891,6 +4891,12 @@ inline void gcode_M503() {
    */
   inline void gcode_M600() {
     float target[NUM_AXIS], lastpos[NUM_AXIS], fr60 = feedrate / 60;
+    if (degHotend(active_extruder) < extrude_min_temp) {
+      SERIAL_ERROR_START;
+      SERIAL_ERRORLNPGM(MSG_TOO_COLD_FOR_M600);
+      return;
+    }
+
     for (int i=0; i<NUM_AXIS; i++)
       target[i] = lastpos[i] = current_position[i];
 
diff --git a/Marlin/configurator/config/language.h b/Marlin/configurator/config/language.h
index 5f3d790c5e..f83a0d9a1e 100644
--- a/Marlin/configurator/config/language.h
+++ b/Marlin/configurator/config/language.h
@@ -170,6 +170,7 @@
 #define MSG_ENDSTOPS_HIT                    "endstops hit: "
 #define MSG_ERR_COLD_EXTRUDE_STOP           " cold extrusion prevented"
 #define MSG_ERR_LONG_EXTRUDE_STOP           " too long extrusion prevented"
+#define MSG_TOO_COLD_FOR_M600               "M600 Hotend too cold to change filament"
 #define MSG_BABYSTEPPING_X                  "Babystepping X"
 #define MSG_BABYSTEPPING_Y                  "Babystepping Y"
 #define MSG_BABYSTEPPING_Z                  "Babystepping Z"
diff --git a/Marlin/language.h b/Marlin/language.h
index eb20a5b92b..1405252700 100644
--- a/Marlin/language.h
+++ b/Marlin/language.h
@@ -171,6 +171,7 @@
 #define MSG_ENDSTOPS_HIT                    "endstops hit: "
 #define MSG_ERR_COLD_EXTRUDE_STOP           " cold extrusion prevented"
 #define MSG_ERR_LONG_EXTRUDE_STOP           " too long extrusion prevented"
+#define MSG_TOO_COLD_FOR_M600               "M600 Hotend too cold to change filament"
 #define MSG_BABYSTEPPING_X                  "Babystepping X"
 #define MSG_BABYSTEPPING_Y                  "Babystepping Y"
 #define MSG_BABYSTEPPING_Z                  "Babystepping Z"