Edit thermal runaway description

Marlin/Configuration.h

 #define EXTRUDE_MAXLENGTH (X_MAX_LENGTH+Y_MAX_LENGTH) //prevent extrusion of very large distances.
 
 //===========================================================================
-//============================= Thermal Runaway Protection ==================
+//======================== Thermal Runaway Protection =======================
 //===========================================================================
-/*
-This is a feature to protect your printer from burn up in flames if it has
-a thermistor coming off place (this happened to a friend of mine recently and
-motivated me writing this feature).
-
-The issue: If a thermistor come off, it will read a lower temperature than actual.
-The system will turn the heater on forever, burning up the filament and anything
-else around.
-
-After the temperature reaches the target for the first time, this feature will
-start measuring for how long the current temperature stays below the target
-minus _HYSTERESIS (set_temperature - THERMAL_RUNAWAY_PROTECTION_HYSTERESIS).
 
-If it stays longer than _PERIOD, it means the thermistor temperature
-cannot catch up with the target, so something *may be* wrong. Then, to be on the
-safe side, the system will he halt.
-
-Bear in mind the count down will just start AFTER the first time the
-thermistor temperature is over the target, so you will have no problem if
-your extruder heater takes 2 minutes to hit the target on heating.
-
-*/
-// If you want to enable this feature for all your extruder heaters,
-// uncomment the 2 defines below:
+/**
+ * Thermal Runaway Protection protects your printer from damage and fire if a
+ * thermistor falls out or temperature sensors fail in any way.
+ *
+ * The issue: If a thermistor falls out or a temperature sensor fails,
+ * Marlin can no longer sense the actual temperature. Since a disconnected
+ * thermistor reads as a low temperature, the firmware will keep the heater on.
+ *
+ * The solution: Once the temperature reaches the target, start observing.
+ * If the temperature stays too far below the target (hysteresis) for too long,
+ * the firmware will halt as a safety precaution.
+ *
+ * Note that because the countdown starts only AFTER the temperature reaches
+ * the target, this will not catch a thermistor that is already disconnected
+ * when the print starts!
+ *
+ * To enable for all extruder heaters, uncomment the two defines below:
+ */
 
 // Parameters for all extruder heaters
-#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 //in seconds
+#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 // in seconds
 #define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
 
-// If you want to enable this feature for your bed heater,
-// uncomment the 2 defines below:
+// To enable for the bed heater, uncomment the two defines below:
 
 // Parameters for the bed heater
-#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 //in seconds
+#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 // in seconds
 #define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 2 // in degree Celsius
 
 
 #define Z_MAX_POS 200
 
 //===========================================================================
-//============================= Filament Runout Sensor ======================
+//========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
                                  // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
 //#define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.
 
 //===========================================================================
-//============================ Mesh Bed Leveling ============================
+//=========================== Manual Bed Leveling ===========================
 //===========================================================================
 
 // #define MANUAL_BED_LEVELING  // Add display menu option for bed leveling
 #endif  // MESH_BED_LEVELING
 
 //===========================================================================
-//============================= Bed Auto Leveling ===========================
+//============================ Bed Auto Leveling ============================
 //===========================================================================
 
 // @section bedlevel

Marlin/configurator/config/Configuration.h

 #define EXTRUDE_MAXLENGTH (X_MAX_LENGTH+Y_MAX_LENGTH) //prevent extrusion of very large distances.
 
 //===========================================================================
-//============================= Thermal Runaway Protection ==================
+//======================== Thermal Runaway Protection =======================
 //===========================================================================
-/*
-This is a feature to protect your printer from burn up in flames if it has
-a thermistor coming off place (this happened to a friend of mine recently and
-motivated me writing this feature).
-
-The issue: If a thermistor come off, it will read a lower temperature than actual.
-The system will turn the heater on forever, burning up the filament and anything
-else around.
-
-After the temperature reaches the target for the first time, this feature will
-start measuring for how long the current temperature stays below the target
-minus _HYSTERESIS (set_temperature - THERMAL_RUNAWAY_PROTECTION_HYSTERESIS).
 
-If it stays longer than _PERIOD, it means the thermistor temperature
-cannot catch up with the target, so something *may be* wrong. Then, to be on the
-safe side, the system will he halt.
-
-Bear in mind the count down will just start AFTER the first time the
-thermistor temperature is over the target, so you will have no problem if
-your extruder heater takes 2 minutes to hit the target on heating.
-
-*/
-// If you want to enable this feature for all your extruder heaters,
-// uncomment the 2 defines below:
+/**
+ * Thermal Runaway Protection protects your printer from damage and fire if a
+ * thermistor falls out or temperature sensors fail in any way.
+ *
+ * The issue: If a thermistor falls out or a temperature sensor fails,
+ * Marlin can no longer sense the actual temperature. Since a disconnected
+ * thermistor reads as a low temperature, the firmware will keep the heater on.
+ *
+ * The solution: Once the temperature reaches the target, start observing.
+ * If the temperature stays too far below the target (hysteresis) for too long,
+ * the firmware will halt as a safety precaution.
+ *
+ * Note that because the countdown starts only AFTER the temperature reaches
+ * the target, this will not catch a thermistor that is already disconnected
+ * when the print starts!
+ *
+ * To enable for all extruder heaters, uncomment the two defines below:
+ */
 
 // Parameters for all extruder heaters
-#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 //in seconds
+#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 // in seconds
 #define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
 
-// If you want to enable this feature for your bed heater,
-// uncomment the 2 defines below:
+// To enable for the bed heater, uncomment the two defines below:
 
 // Parameters for the bed heater
-#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 //in seconds
+#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 // in seconds
 #define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 2 // in degree Celsius
 
 //===========================================================================
 #define Z_MAX_POS 200
 
 //===========================================================================
-//============================= Filament Runout Sensor ======================
+//========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
                                  // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
 //#define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.
 
 //===========================================================================
-//============================ Manual Bed Leveling ==========================
+//=========================== Manual Bed Leveling ===========================
 //===========================================================================
 
 // #define MANUAL_BED_LEVELING  // Add display menu option for bed leveling
 #endif  // MESH_BED_LEVELING
 
 //===========================================================================
-//============================= Bed Auto Leveling ===========================
+//============================ Bed Auto Leveling ============================
 //===========================================================================
 
 // @section bedlevel

Marlin/example_configurations/Felix/Configuration.h

 #define EXTRUDE_MAXLENGTH (X_MAX_LENGTH+Y_MAX_LENGTH) //prevent extrusion of very large distances.
 
 //===========================================================================
-//============================= Thermal Runaway Protection ==================
+//======================== Thermal Runaway Protection =======================
 //===========================================================================
-/*
-This is a feature to protect your printer from burn up in flames if it has
-a thermistor coming off place (this happened to a friend of mine recently and
-motivated me writing this feature).
-
-The issue: If a thermistor come off, it will read a lower temperature than actual.
-The system will turn the heater on forever, burning up the filament and anything
-else around.
-
-After the temperature reaches the target for the first time, this feature will
-start measuring for how long the current temperature stays below the target
-minus _HYSTERESIS (set_temperature - THERMAL_RUNAWAY_PROTECTION_HYSTERESIS).
 
-If it stays longer than _PERIOD, it means the thermistor temperature
-cannot catch up with the target, so something *may be* wrong. Then, to be on the
-safe side, the system will he halt.
-
-Bear in mind the count down will just start AFTER the first time the
-thermistor temperature is over the target, so you will have no problem if
-your extruder heater takes 2 minutes to hit the target on heating.
-
-*/
-// If you want to enable this feature for all your extruder heaters,
-// uncomment the 2 defines below:
+/**
+ * Thermal Runaway Protection protects your printer from damage and fire if a
+ * thermistor falls out or temperature sensors fail in any way.
+ *
+ * The issue: If a thermistor falls out or a temperature sensor fails,
+ * Marlin can no longer sense the actual temperature. Since a disconnected
+ * thermistor reads as a low temperature, the firmware will keep the heater on.
+ *
+ * The solution: Once the temperature reaches the target, start observing.
+ * If the temperature stays too far below the target (hysteresis) for too long,
+ * the firmware will halt as a safety precaution.
+ *
+ * Note that because the countdown starts only AFTER the temperature reaches
+ * the target, this will not catch a thermistor that is already disconnected
+ * when the print starts!
+ *
+ * To enable for all extruder heaters, uncomment the two defines below:
+ */
 
 // Parameters for all extruder heaters
-#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 //in seconds
+#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 // in seconds
 #define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
 
-// If you want to enable this feature for your bed heater,
-// uncomment the 2 defines below:
+// To enable for the bed heater, uncomment the two defines below:
 
 // Parameters for the bed heater
-#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 //in seconds
+#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 // in seconds
 #define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 2 // in degree Celsius
 
 //===========================================================================
 #define Z_MAX_POS 235
 
 //===========================================================================
-//============================= Filament Runout Sensor ======================
+//========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
                                  // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
 //#define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.
 
 //===========================================================================
-//============================ Manual Bed Leveling ==========================
+//=========================== Manual Bed Leveling ===========================
 //===========================================================================
 
 // #define MANUAL_BED_LEVELING  // Add display menu option for bed leveling
 #endif  // MESH_BED_LEVELING
 
 //===========================================================================
-//============================= Bed Auto Leveling ===========================
+//============================ Bed Auto Leveling ============================
 //===========================================================================
 
 //#define ENABLE_AUTO_BED_LEVELING // Delete the comment to enable (remove // at the start of the line)

Marlin/example_configurations/Felix/Configuration_DUAL.h

 #define EXTRUDE_MAXLENGTH (X_MAX_LENGTH+Y_MAX_LENGTH) //prevent extrusion of very large distances.
 
 //===========================================================================
-//============================= Thermal Runaway Protection ==================
+//======================== Thermal Runaway Protection =======================
 //===========================================================================
-/*
-This is a feature to protect your printer from burn up in flames if it has
-a thermistor coming off place (this happened to a friend of mine recently and
-motivated me writing this feature).
-
-The issue: If a thermistor come off, it will read a lower temperature than actual.
-The system will turn the heater on forever, burning up the filament and anything
-else around.
-
-After the temperature reaches the target for the first time, this feature will
-start measuring for how long the current temperature stays below the target
-minus _HYSTERESIS (set_temperature - THERMAL_RUNAWAY_PROTECTION_HYSTERESIS).
 
-If it stays longer than _PERIOD, it means the thermistor temperature
-cannot catch up with the target, so something *may be* wrong. Then, to be on the
-safe side, the system will he halt.
-
-Bear in mind the count down will just start AFTER the first time the
-thermistor temperature is over the target, so you will have no problem if
-your extruder heater takes 2 minutes to hit the target on heating.
-
-*/
-// If you want to enable this feature for all your extruder heaters,
-// uncomment the 2 defines below:
+/**
+ * Thermal Runaway Protection protects your printer from damage and fire if a
+ * thermistor falls out or temperature sensors fail in any way.
+ *
+ * The issue: If a thermistor falls out or a temperature sensor fails,
+ * Marlin can no longer sense the actual temperature. Since a disconnected
+ * thermistor reads as a low temperature, the firmware will keep the heater on.
+ *
+ * The solution: Once the temperature reaches the target, start observing.
+ * If the temperature stays too far below the target (hysteresis) for too long,
+ * the firmware will halt as a safety precaution.
+ *
+ * Note that because the countdown starts only AFTER the temperature reaches
+ * the target, this will not catch a thermistor that is already disconnected
+ * when the print starts!
+ *
+ * To enable for all extruder heaters, uncomment the two defines below:
+ */
 
 // Parameters for all extruder heaters
-#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 //in seconds
+#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 // in seconds
 #define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
 
-// If you want to enable this feature for your bed heater,
-// uncomment the 2 defines below:
+// To enable for the bed heater, uncomment the two defines below:
 
 // Parameters for the bed heater
-#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 //in seconds
+#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 // in seconds
 #define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 2 // in degree Celsius
 
 //===========================================================================
 #define Z_MAX_POS 235
 
 //===========================================================================
-//============================= Filament Runout Sensor ======================
+//========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
                                  // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
 //#define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.
 
 //===========================================================================
-//============================ Manual Bed Leveling ==========================
+//=========================== Manual Bed Leveling ===========================
 //===========================================================================
 
 // #define MANUAL_BED_LEVELING  // Add display menu option for bed leveling
 #endif  // MESH_BED_LEVELING
 
 //===========================================================================
-//============================= Bed Auto Leveling ===========================
+//============================ Bed Auto Leveling ============================
 //===========================================================================
 
 //#define ENABLE_AUTO_BED_LEVELING // Delete the comment to enable (remove // at the start of the line)

Marlin/example_configurations/Hephestos/Configuration.h

 #define EXTRUDE_MAXLENGTH (X_MAX_LENGTH+Y_MAX_LENGTH) //prevent extrusion of very large distances.
 
 //===========================================================================
-//============================= Thermal Runaway Protection ==================
+//======================== Thermal Runaway Protection =======================
 //===========================================================================
-/*
-This is a feature to protect your printer from burn up in flames if it has
-a thermistor coming off place (this happened to a friend of mine recently and
-motivated me writing this feature).
-
-The issue: If a thermistor come off, it will read a lower temperature than actual.
-The system will turn the heater on forever, burning up the filament and anything
-else around.
-
-After the temperature reaches the target for the first time, this feature will
-start measuring for how long the current temperature stays below the target
-minus _HYSTERESIS (set_temperature - THERMAL_RUNAWAY_PROTECTION_HYSTERESIS).
 
-If it stays longer than _PERIOD, it means the thermistor temperature
-cannot catch up with the target, so something *may be* wrong. Then, to be on the
-safe side, the system will he halt.
-
-Bear in mind the count down will just start AFTER the first time the
-thermistor temperature is over the target, so you will have no problem if
-your extruder heater takes 2 minutes to hit the target on heating.
-
-*/
-// If you want to enable this feature for all your extruder heaters,
-// uncomment the 2 defines below:
+/**
+ * Thermal Runaway Protection protects your printer from damage and fire if a
+ * thermistor falls out or temperature sensors fail in any way.
+ *
+ * The issue: If a thermistor falls out or a temperature sensor fails,
+ * Marlin can no longer sense the actual temperature. Since a disconnected
+ * thermistor reads as a low temperature, the firmware will keep the heater on.
+ *
+ * The solution: Once the temperature reaches the target, start observing.
+ * If the temperature stays too far below the target (hysteresis) for too long,
+ * the firmware will halt as a safety precaution.
+ *
+ * Note that because the countdown starts only AFTER the temperature reaches
+ * the target, this will not catch a thermistor that is already disconnected
+ * when the print starts!
+ *
+ * To enable for all extruder heaters, uncomment the two defines below:
+ */
 
 // Parameters for all extruder heaters
-#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 //in seconds
+#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 // in seconds
 #define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
 
-// If you want to enable this feature for your bed heater,
-// uncomment the 2 defines below:
+// To enable for the bed heater, uncomment the two defines below:
 
 // Parameters for the bed heater
-#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 //in seconds
+#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 // in seconds
 #define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 2 // in degree Celsius
 
 //===========================================================================
 #define Z_MAX_POS 180
 
 //===========================================================================
-//============================= Filament Runout Sensor ======================
+//========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
                                  // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
 //#define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.
 
 //===========================================================================
-//============================ Manual Bed Leveling ==========================
+//=========================== Manual Bed Leveling ===========================
 //===========================================================================
 
 // #define MANUAL_BED_LEVELING  // Add display menu option for bed leveling
 #endif  // MESH_BED_LEVELING
 
 //===========================================================================
-//============================= Bed Auto Leveling ===========================
+//============================ Bed Auto Leveling ============================
 //===========================================================================
 
 //#define ENABLE_AUTO_BED_LEVELING // Delete the comment to enable (remove // at the start of the line)

Marlin/example_configurations/K8200/Configuration.h

 #define EXTRUDE_MAXLENGTH (X_MAX_LENGTH+Y_MAX_LENGTH) //prevent extrusion of very large distances.
 
 //===========================================================================
-//============================= Thermal Runaway Protection ==================
+//======================== Thermal Runaway Protection =======================
 //===========================================================================
-/*
-This is a feature to protect your printer from burn up in flames if it has
-a thermistor coming off place (this happened to a friend of mine recently and
-motivated me writing this feature).
-
-The issue: If a thermistor come off, it will read a lower temperature than actual.
-The system will turn the heater on forever, burning up the filament and anything
-else around.
-
-After the temperature reaches the target for the first time, this feature will
-start measuring for how long the current temperature stays below the target
-minus _HYSTERESIS (set_temperature - THERMAL_RUNAWAY_PROTECTION_HYSTERESIS).
 
-If it stays longer than _PERIOD, it means the thermistor temperature
-cannot catch up with the target, so something *may be* wrong. Then, to be on the
-safe side, the system will he halt.
-
-Bear in mind the count down will just start AFTER the first time the
-thermistor temperature is over the target, so you will have no problem if
-your extruder heater takes 2 minutes to hit the target on heating.
-
-*/
-// If you want to enable this feature for all your extruder heaters,
-// uncomment the 2 defines below:
+/**
+ * Thermal Runaway Protection protects your printer from damage and fire if a
+ * thermistor falls out or temperature sensors fail in any way.
+ *
+ * The issue: If a thermistor falls out or a temperature sensor fails,
+ * Marlin can no longer sense the actual temperature. Since a disconnected
+ * thermistor reads as a low temperature, the firmware will keep the heater on.
+ *
+ * The solution: Once the temperature reaches the target, start observing.
+ * If the temperature stays too far below the target (hysteresis) for too long,
+ * the firmware will halt as a safety precaution.
+ *
+ * Note that because the countdown starts only AFTER the temperature reaches
+ * the target, this will not catch a thermistor that is already disconnected
+ * when the print starts!
+ *
+ * To enable for all extruder heaters, uncomment the two defines below:
+ */
 
 // Parameters for all extruder heaters
-#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 //in seconds
+#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 // in seconds
 #define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
 
-// If you want to enable this feature for your bed heater,
-// uncomment the 2 defines below:
+// To enable for the bed heater, uncomment the two defines below:
 
 // Parameters for the bed heater
-#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 //in seconds
+#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 // in seconds
 #define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 2 // in degree Celsius
 
 //===========================================================================
 #define Z_MAX_POS 200
 
 //===========================================================================
-//============================= Filament Runout Sensor ======================
+//========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
                                  // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
 //#define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.
 
 //===========================================================================
-//============================ Mesh Bed Leveling ============================
+//=========================== Manual Bed Leveling ===========================
 //===========================================================================
 
 // #define MANUAL_BED_LEVELING  // Add display menu option for bed leveling
 #endif  // MESH_BED_LEVELING
 
 //===========================================================================
-//============================= Bed Auto Leveling ===========================
+//============================ Bed Auto Leveling ============================
 //===========================================================================
 
 // @section bedlevel

Marlin/example_configurations/SCARA/Configuration.h

 #define EXTRUDE_MAXLENGTH (X_MAX_LENGTH+Y_MAX_LENGTH) //prevent extrusion of very large distances.
 
 //===========================================================================
-//============================= Thermal Runaway Protection ==================
+//======================== Thermal Runaway Protection =======================
 //===========================================================================
-/*
-This is a feature to protect your printer from burn up in flames if it has
-a thermistor coming off place (this happened to a friend of mine recently and
-motivated me writing this feature).
-
-The issue: If a thermistor come off, it will read a lower temperature than actual.
-The system will turn the heater on forever, burning up the filament and anything
-else around.
-
-After the temperature reaches the target for the first time, this feature will
-start measuring for how long the current temperature stays below the target
-minus _HYSTERESIS (set_temperature - THERMAL_RUNAWAY_PROTECTION_HYSTERESIS).
 
-If it stays longer than _PERIOD, it means the thermistor temperature
-cannot catch up with the target, so something *may be* wrong. Then, to be on the
-safe side, the system will he halt.
-
-Bear in mind the count down will just start AFTER the first time the
-thermistor temperature is over the target, so you will have no problem if
-your extruder heater takes 2 minutes to hit the target on heating.
-
-*/
-// If you want to enable this feature for all your extruder heaters,
-// uncomment the 2 defines below:
+/**
+ * Thermal Runaway Protection protects your printer from damage and fire if a
+ * thermistor falls out or temperature sensors fail in any way.
+ *
+ * The issue: If a thermistor falls out or a temperature sensor fails,
+ * Marlin can no longer sense the actual temperature. Since a disconnected
+ * thermistor reads as a low temperature, the firmware will keep the heater on.
+ *
+ * The solution: Once the temperature reaches the target, start observing.
+ * If the temperature stays too far below the target (hysteresis) for too long,
+ * the firmware will halt as a safety precaution.
+ *
+ * Note that because the countdown starts only AFTER the temperature reaches
+ * the target, this will not catch a thermistor that is already disconnected
+ * when the print starts!
+ *
+ * To enable for all extruder heaters, uncomment the two defines below:
+ */
 
 // Parameters for all extruder heaters
-#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 //in seconds
+#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 // in seconds
 #define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
 
-// If you want to enable this feature for your bed heater,
-// uncomment the 2 defines below:
+// To enable for the bed heater, uncomment the two defines below:
 
 // Parameters for the bed heater
-#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 //in seconds
+#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 // in seconds
 #define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 2 // in degree Celsius
 
 //===========================================================================
 #define Z_MAX_POS 225
 
 //===========================================================================
-//============================= Filament Runout Sensor ======================
+//========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
                                  // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
 //#define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.
 
 //===========================================================================
-//============================ Manual Bed Leveling ==========================
+//=========================== Manual Bed Leveling ===========================
 //===========================================================================
 
 // #define MANUAL_BED_LEVELING  // Add display menu option for bed leveling
 #endif  // MESH_BED_LEVELING
 
 //===========================================================================
-//============================= Bed Auto Leveling ===========================
+//============================ Bed Auto Leveling ============================
 //===========================================================================
 
 //#define ENABLE_AUTO_BED_LEVELING // Delete the comment to enable (remove // at the start of the line)

Marlin/example_configurations/WITBOX/Configuration.h

 #define EXTRUDE_MAXLENGTH (X_MAX_LENGTH+Y_MAX_LENGTH) //prevent extrusion of very large distances.
 
 //===========================================================================
-//============================= Thermal Runaway Protection ==================
+//======================== Thermal Runaway Protection =======================
 //===========================================================================
-/*
-This is a feature to protect your printer from burn up in flames if it has
-a thermistor coming off place (this happened to a friend of mine recently and
-motivated me writing this feature).
-
-The issue: If a thermistor come off, it will read a lower temperature than actual.
-The system will turn the heater on forever, burning up the filament and anything
-else around.
-
-After the temperature reaches the target for the first time, this feature will
-start measuring for how long the current temperature stays below the target
-minus _HYSTERESIS (set_temperature - THERMAL_RUNAWAY_PROTECTION_HYSTERESIS).
 
-If it stays longer than _PERIOD, it means the thermistor temperature
-cannot catch up with the target, so something *may be* wrong. Then, to be on the
-safe side, the system will he halt.
-
-Bear in mind the count down will just start AFTER the first time the
-thermistor temperature is over the target, so you will have no problem if
-your extruder heater takes 2 minutes to hit the target on heating.
-
-*/
-// If you want to enable this feature for all your extruder heaters,
-// uncomment the 2 defines below:
+/**
+ * Thermal Runaway Protection protects your printer from damage and fire if a
+ * thermistor falls out or temperature sensors fail in any way.
+ *
+ * The issue: If a thermistor falls out or a temperature sensor fails,
+ * Marlin can no longer sense the actual temperature. Since a disconnected
+ * thermistor reads as a low temperature, the firmware will keep the heater on.
+ *
+ * The solution: Once the temperature reaches the target, start observing.
+ * If the temperature stays too far below the target (hysteresis) for too long,
+ * the firmware will halt as a safety precaution.
+ *
+ * Note that because the countdown starts only AFTER the temperature reaches
+ * the target, this will not catch a thermistor that is already disconnected
+ * when the print starts!
+ *
+ * To enable for all extruder heaters, uncomment the two defines below:
+ */
 
 // Parameters for all extruder heaters
-#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 //in seconds
+#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 // in seconds
 #define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
 
-// If you want to enable this feature for your bed heater,
-// uncomment the 2 defines below:
+// To enable for the bed heater, uncomment the two defines below:
 
 // Parameters for the bed heater
-#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 //in seconds
+#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 // in seconds
 #define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 2 // in degree Celsius
 
 //===========================================================================
 #define Z_MAX_POS 200
 
 //===========================================================================
-//============================= Filament Runout Sensor ======================
+//========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
                                  // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
 //#define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.
 
 //===========================================================================
-//============================ Manual Bed Leveling ==========================
+//=========================== Manual Bed Leveling ===========================
 //===========================================================================
 
 // #define MANUAL_BED_LEVELING  // Add display menu option for bed leveling
 #endif  // MESH_BED_LEVELING
 
 //===========================================================================
-//============================= Bed Auto Leveling ===========================
+//============================ Bed Auto Leveling ============================
 //===========================================================================
 
 //#define ENABLE_AUTO_BED_LEVELING // Delete the comment to enable (remove // at the start of the line)

Marlin/example_configurations/delta/biv2.5/Configuration.h

 #define EXTRUDE_MAXLENGTH (X_MAX_LENGTH+Y_MAX_LENGTH) //prevent extrusion of very large distances.
 
 //===========================================================================
-//============================= Thermal Runaway Protection ==================
+//======================== Thermal Runaway Protection =======================
 //===========================================================================
-/*
-This is a feature to protect your printer from burn up in flames if it has
-a thermistor coming off place (this happened to a friend of mine recently and
-motivated me writing this feature).
-
-The issue: If a thermistor come off, it will read a lower temperature than actual.
-The system will turn the heater on forever, burning up the filament and anything
-else around.
-
-After the temperature reaches the target for the first time, this feature will
-start measuring for how long the current temperature stays below the target
-minus _HYSTERESIS (set_temperature - THERMAL_RUNAWAY_PROTECTION_HYSTERESIS).
 
-If it stays longer than _PERIOD, it means the thermistor temperature
-cannot catch up with the target, so something *may be* wrong. Then, to be on the
-safe side, the system will he halt.
-
-Bear in mind the count down will just start AFTER the first time the
-thermistor temperature is over the target, so you will have no problem if
-your extruder heater takes 2 minutes to hit the target on heating.
-
-*/
-// If you want to enable this feature for all your extruder heaters,
-// uncomment the 2 defines below:
+/**
+ * Thermal Runaway Protection protects your printer from damage and fire if a
+ * thermistor falls out or temperature sensors fail in any way.
+ *
+ * The issue: If a thermistor falls out or a temperature sensor fails,
+ * Marlin can no longer sense the actual temperature. Since a disconnected
+ * thermistor reads as a low temperature, the firmware will keep the heater on.
+ *
+ * The solution: Once the temperature reaches the target, start observing.
+ * If the temperature stays too far below the target (hysteresis) for too long,
+ * the firmware will halt as a safety precaution.
+ *
+ * Note that because the countdown starts only AFTER the temperature reaches
+ * the target, this will not catch a thermistor that is already disconnected
+ * when the print starts!
+ *
+ * To enable for all extruder heaters, uncomment the two defines below:
+ */
 
 // Parameters for all extruder heaters
-#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 //in seconds
+#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 // in seconds
 #define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
 
-// If you want to enable this feature for your bed heater,
-// uncomment the 2 defines below:
+// To enable for the bed heater, uncomment the two defines below:
 
 // Parameters for the bed heater
-#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 120 //in seconds
+#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 120 // in seconds
 #define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 4 // in degree Celsius
 
 //===========================================================================
 #define Z_MAX_POS MANUAL_Z_HOME_POS
 
 //===========================================================================
-//============================= Filament Runout Sensor ======================
+//========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
                                  // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
 //#define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.
 
 //===========================================================================
-//============================ Manual Bed Leveling ==========================
+//=========================== Manual Bed Leveling ===========================
 //===========================================================================
 
 // #define MANUAL_BED_LEVELING  // Add display menu option for bed leveling
 #endif  // MESH_BED_LEVELING
 
 //===========================================================================
-//============================= Bed Auto Leveling ===========================
+//============================ Bed Auto Leveling ============================
 //===========================================================================
 
 //#define ENABLE_AUTO_BED_LEVELING // Delete the comment to enable (remove // at the start of the line)

Marlin/example_configurations/delta/generic/Configuration.h

 #define EXTRUDE_MAXLENGTH (X_MAX_LENGTH+Y_MAX_LENGTH) //prevent extrusion of very large distances.
 
 //===========================================================================
-//============================= Thermal Runaway Protection ==================
+//======================== Thermal Runaway Protection =======================
 //===========================================================================
-/*
-This is a feature to protect your printer from burn up in flames if it has
-a thermistor coming off place (this happened to a friend of mine recently and
-motivated me writing this feature).
-
-The issue: If a thermistor come off, it will read a lower temperature than actual.
-The system will turn the heater on forever, burning up the filament and anything
-else around.
-
-After the temperature reaches the target for the first time, this feature will
-start measuring for how long the current temperature stays below the target
-minus _HYSTERESIS (set_temperature - THERMAL_RUNAWAY_PROTECTION_HYSTERESIS).
 
-If it stays longer than _PERIOD, it means the thermistor temperature
-cannot catch up with the target, so something *may be* wrong. Then, to be on the
-safe side, the system will he halt.
-
-Bear in mind the count down will just start AFTER the first time the
-thermistor temperature is over the target, so you will have no problem if
-your extruder heater takes 2 minutes to hit the target on heating.
-
-*/
-// If you want to enable this feature for all your extruder heaters,
-// uncomment the 2 defines below:
+/**
+ * Thermal Runaway Protection protects your printer from damage and fire if a
+ * thermistor falls out or temperature sensors fail in any way.
+ *
+ * The issue: If a thermistor falls out or a temperature sensor fails,
+ * Marlin can no longer sense the actual temperature. Since a disconnected
+ * thermistor reads as a low temperature, the firmware will keep the heater on.
+ *
+ * The solution: Once the temperature reaches the target, start observing.
+ * If the temperature stays too far below the target (hysteresis) for too long,
+ * the firmware will halt as a safety precaution.
+ *
+ * Note that because the countdown starts only AFTER the temperature reaches
+ * the target, this will not catch a thermistor that is already disconnected
+ * when the print starts!
+ *
+ * To enable for all extruder heaters, uncomment the two defines below:
+ */
 
 // Parameters for all extruder heaters
-#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 //in seconds
+#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 // in seconds
 #define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
 
-// If you want to enable this feature for your bed heater,
-// uncomment the 2 defines below:
+// To enable for the bed heater, uncomment the two defines below:
 
 // Parameters for the bed heater
-#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 //in seconds
+#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 // in seconds
 #define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 2 // in degree Celsius
 
 //===========================================================================
 #define Z_MAX_POS MANUAL_Z_HOME_POS
 
 //===========================================================================
-//============================= Filament Runout Sensor ======================
+//========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
                                  // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
 //#define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.
 
 //===========================================================================
-//============================ Manual Bed Leveling ==========================
+//=========================== Manual Bed Leveling ===========================
 //===========================================================================
 
 // #define MANUAL_BED_LEVELING  // Add display menu option for bed leveling
 #endif  // MESH_BED_LEVELING
 
 //===========================================================================
-//============================= Bed Auto Leveling ===========================
+//============================ Bed Auto Leveling ============================
 //===========================================================================
 
 //#define ENABLE_AUTO_BED_LEVELING // Delete the comment to enable (remove // at the start of the line)

Marlin/example_configurations/delta/kossel_mini/Configuration.h

 #define EXTRUDE_MAXLENGTH (X_MAX_LENGTH+Y_MAX_LENGTH) //prevent extrusion of very large distances.
 
 //===========================================================================
-//============================= Thermal Runaway Protection ==================
+//======================== Thermal Runaway Protection =======================
 //===========================================================================
-/*
-This is a feature to protect your printer from burn up in flames if it has
-a thermistor coming off place (this happened to a friend of mine recently and
-motivated me writing this feature).
-
-The issue: If a thermistor come off, it will read a lower temperature than actual.
-The system will turn the heater on forever, burning up the filament and anything
-else around.
-
-After the temperature reaches the target for the first time, this feature will
-start measuring for how long the current temperature stays below the target
-minus _HYSTERESIS (set_temperature - THERMAL_RUNAWAY_PROTECTION_HYSTERESIS).
 
-If it stays longer than _PERIOD, it means the thermistor temperature
-cannot catch up with the target, so something *may be* wrong. Then, to be on the
-safe side, the system will he halt.
-
-Bear in mind the count down will just start AFTER the first time the
-thermistor temperature is over the target, so you will have no problem if
-your extruder heater takes 2 minutes to hit the target on heating.
-
-*/
-// If you want to enable this feature for all your extruder heaters,
-// uncomment the 2 defines below:
+/**
+ * Thermal Runaway Protection protects your printer from damage and fire if a
+ * thermistor falls out or temperature sensors fail in any way.
+ *
+ * The issue: If a thermistor falls out or a temperature sensor fails,
+ * Marlin can no longer sense the actual temperature. Since a disconnected
+ * thermistor reads as a low temperature, the firmware will keep the heater on.
+ *
+ * The solution: Once the temperature reaches the target, start observing.
+ * If the temperature stays too far below the target (hysteresis) for too long,
+ * the firmware will halt as a safety precaution.
+ *
+ * Note that because the countdown starts only AFTER the temperature reaches
+ * the target, this will not catch a thermistor that is already disconnected
+ * when the print starts!
+ *
+ * To enable for all extruder heaters, uncomment the two defines below:
+ */
 
 // Parameters for all extruder heaters
-#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 //in seconds
+#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 // in seconds
 #define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
 
-// If you want to enable this feature for your bed heater,
-// uncomment the 2 defines below:
+// To enable for the bed heater, uncomment the two defines below:
 
 // Parameters for the bed heater
-#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 //in seconds
+#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 // in seconds
 #define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 2 // in degree Celsius
 
 //===========================================================================
 #define Z_MAX_POS MANUAL_Z_HOME_POS
 
 //===========================================================================
-//============================= Filament Runout Sensor ======================
+//========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
                                  // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
 //#define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.
 
 //===========================================================================
-//============================ Manual Bed Leveling ==========================
+//=========================== Manual Bed Leveling ===========================
 //===========================================================================
 
 // #define MANUAL_BED_LEVELING  // Add display menu option for bed leveling
 #endif  // MESH_BED_LEVELING
 
 //===========================================================================
-//============================= Bed Auto Leveling ===========================
+//============================ Bed Auto Leveling ============================
 //===========================================================================
 
 #define ENABLE_AUTO_BED_LEVELING // Delete the comment to enable (remove // at the start of the line)

Marlin/example_configurations/makibox/Configuration.h

 #define EXTRUDE_MAXLENGTH (X_MAX_LENGTH+Y_MAX_LENGTH) //prevent extrusion of very large distances.
 
 //===========================================================================
-//============================= Thermal Runaway Protection ==================
+//======================== Thermal Runaway Protection =======================
 //===========================================================================
-/*
-This is a feature to protect your printer from burn up in flames if it has
-a thermistor coming off place (this happened to a friend of mine recently and
-motivated me writing this feature).
-
-The issue: If a thermistor come off, it will read a lower temperature than actual.
-The system will turn the heater on forever, burning up the filament and anything
-else around.
-
-After the temperature reaches the target for the first time, this feature will
-start measuring for how long the current temperature stays below the target
-minus _HYSTERESIS (set_temperature - THERMAL_RUNAWAY_PROTECTION_HYSTERESIS).
 
-If it stays longer than _PERIOD, it means the thermistor temperature
-cannot catch up with the target, so something *may be* wrong. Then, to be on the
-safe side, the system will he halt.
-
-Bear in mind the count down will just start AFTER the first time the
-thermistor temperature is over the target, so you will have no problem if
-your extruder heater takes 2 minutes to hit the target on heating.
-
-*/
-// If you want to enable this feature for all your extruder heaters,
-// uncomment the 2 defines below:
+/**
+ * Thermal Runaway Protection protects your printer from damage and fire if a
+ * thermistor falls out or temperature sensors fail in any way.
+ *
+ * The issue: If a thermistor falls out or a temperature sensor fails,
+ * Marlin can no longer sense the actual temperature. Since a disconnected
+ * thermistor reads as a low temperature, the firmware will keep the heater on.
+ *
+ * The solution: Once the temperature reaches the target, start observing.
+ * If the temperature stays too far below the target (hysteresis) for too long,
+ * the firmware will halt as a safety precaution.
+ *
+ * Note that because the countdown starts only AFTER the temperature reaches
+ * the target, this will not catch a thermistor that is already disconnected
+ * when the print starts!
+ *
+ * To enable for all extruder heaters, uncomment the two defines below:
+ */
 
 // Parameters for all extruder heaters
-#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 //in seconds
+#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 // in seconds
 #define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
 
-// If you want to enable this feature for your bed heater,
-// uncomment the 2 defines below:
+// To enable for the bed heater, uncomment the two defines below:
 
 // Parameters for the bed heater
-#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 //in seconds
+#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 // in seconds
 #define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 2 // in degree Celsius
 
 //===========================================================================
 #define Z_MAX_POS 86
 
 //===========================================================================
-//============================= Filament Runout Sensor ======================
+//========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
                                  // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
 //#define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.
 
 //===========================================================================
-//============================ Manual Bed Leveling ==========================
+//=========================== Manual Bed Leveling ===========================
 //===========================================================================
 
 // #define MANUAL_BED_LEVELING  // Add display menu option for bed leveling
 #endif  // MESH_BED_LEVELING
 
 //===========================================================================
-//============================= Bed Auto Leveling ===========================
+//============================ Bed Auto Leveling ============================
 //===========================================================================
 
 //#define ENABLE_AUTO_BED_LEVELING // Delete the comment to enable (remove // at the start of the line)

Marlin/example_configurations/tvrrug/Round2/Configuration.h

 #define EXTRUDE_MAXLENGTH (X_MAX_LENGTH+Y_MAX_LENGTH) //prevent extrusion of very large distances.
 
 //===========================================================================
-//============================= Thermal Runaway Protection ==================
+//======================== Thermal Runaway Protection =======================
 //===========================================================================
-/*
-This is a feature to protect your printer from burn up in flames if it has
-a thermistor coming off place (this happened to a friend of mine recently and
-motivated me writing this feature).
-
-The issue: If a thermistor come off, it will read a lower temperature than actual.
-The system will turn the heater on forever, burning up the filament and anything
-else around.
-
-After the temperature reaches the target for the first time, this feature will
-start measuring for how long the current temperature stays below the target
-minus _HYSTERESIS (set_temperature - THERMAL_RUNAWAY_PROTECTION_HYSTERESIS).
 
-If it stays longer than _PERIOD, it means the thermistor temperature
-cannot catch up with the target, so something *may be* wrong. Then, to be on the
-safe side, the system will he halt.
-
-Bear in mind the count down will just start AFTER the first time the
-thermistor temperature is over the target, so you will have no problem if
-your extruder heater takes 2 minutes to hit the target on heating.
-
-*/
-// If you want to enable this feature for all your extruder heaters,
-// uncomment the 2 defines below:
+/**
+ * Thermal Runaway Protection protects your printer from damage and fire if a
+ * thermistor falls out or temperature sensors fail in any way.
+ *
+ * The issue: If a thermistor falls out or a temperature sensor fails,
+ * Marlin can no longer sense the actual temperature. Since a disconnected
+ * thermistor reads as a low temperature, the firmware will keep the heater on.
+ *
+ * The solution: Once the temperature reaches the target, start observing.
+ * If the temperature stays too far below the target (hysteresis) for too long,
+ * the firmware will halt as a safety precaution.
+ *
+ * Note that because the countdown starts only AFTER the temperature reaches
+ * the target, this will not catch a thermistor that is already disconnected
+ * when the print starts!
+ *
+ * To enable for all extruder heaters, uncomment the two defines below:
+ */
 
 // Parameters for all extruder heaters
-#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 //in seconds
+#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 // in seconds
 #define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
 
-// If you want to enable this feature for your bed heater,
-// uncomment the 2 defines below:
+// To enable for the bed heater, uncomment the two defines below:
 
 // Parameters for the bed heater
-#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 //in seconds
+#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 // in seconds
 #define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 2 // in degree Celsius
 
 //===========================================================================
 #define Z_MAX_POS 120
 
 //===========================================================================
-//============================= Filament Runout Sensor ======================
+//========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
                                  // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
 //#define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.
 
 //===========================================================================
-//============================ Manual Bed Leveling ==========================
+//=========================== Manual Bed Leveling ===========================
 //===========================================================================
 
 // #define MANUAL_BED_LEVELING  // Add display menu option for bed leveling
 #endif  // MESH_BED_LEVELING
 
 //===========================================================================
-//============================= Bed Auto Leveling ===========================
+//============================ Bed Auto Leveling ============================
 //===========================================================================
 
 //#define ENABLE_AUTO_BED_LEVELING // Delete the comment to enable (remove // at the start of the line)