Auto power loss print resume with temperature limitation

Marlin/Configuration_adv.h

@@ -1743,19 +1743,20 @@
    */
   //#define POWER_LOSS_RECOVERY
   #if ENABLED(POWER_LOSS_RECOVERY)
-    #define PLR_ENABLED_DEFAULT   false // Power Loss Recovery enabled by default. (Set with 'M413 Sn' & M500)
-    //#define BACKUP_POWER_SUPPLY       // Backup power / UPS to move the steppers on power loss
-    //#define POWER_LOSS_ZRAISE       2 // (mm) Z axis raise on resume (on power loss with UPS)
-    //#define POWER_LOSS_PIN         44 // Pin to detect power loss. Set to -1 to disable default pin on boards without module.
-    //#define POWER_LOSS_STATE     HIGH // State of pin indicating power loss
-    //#define POWER_LOSS_PULLUP         // Set pullup / pulldown as appropriate for your sensor
+    #define PLR_ENABLED_DEFAULT       false // Power Loss Recovery enabled by default. (Set with 'M413 Sn' & M500)
+    //#define PLR_BED_THRESHOLD BED_MAXTEMP // (°C) Skip user confirmation at or above this bed temperature (0 to disable)
+    //#define BACKUP_POWER_SUPPLY           // Backup power / UPS to move the steppers on power loss
+    //#define POWER_LOSS_ZRAISE           2 // (mm) Z axis raise on resume (on power loss with UPS)
+    //#define POWER_LOSS_PIN             44 // Pin to detect power loss. Set to -1 to disable default pin on boards without module.
+    //#define POWER_LOSS_STATE         HIGH // State of pin indicating power loss
+    //#define POWER_LOSS_PULLUP             // Set pullup / pulldown as appropriate for your sensor
     //#define POWER_LOSS_PULLDOWN
-    //#define POWER_LOSS_PURGE_LEN   20 // (mm) Length of filament to purge on resume
-    //#define POWER_LOSS_RETRACT_LEN 10 // (mm) Length of filament to retract on fail. Requires backup power.
+    //#define POWER_LOSS_PURGE_LEN       20 // (mm) Length of filament to purge on resume
+    //#define POWER_LOSS_RETRACT_LEN     10 // (mm) Length of filament to retract on fail. Requires backup power.
 
     // Without a POWER_LOSS_PIN the following option helps reduce wear on the SD card,
     // especially with "vase mode" printing. Set too high and vases cannot be continued.
-    #define POWER_LOSS_MIN_Z_CHANGE 0.05 // (mm) Minimum Z change before saving power-loss data
+    #define POWER_LOSS_MIN_Z_CHANGE    0.05 // (mm) Minimum Z change before saving power-loss data
 
     // Enable if Z homing is needed for proper recovery. 99.9% of the time this should be disabled!
     //#define POWER_LOSS_RECOVER_ZHOME

Marlin/src/feature/powerloss.cpp

@@ -37,6 +37,10 @@
 
 bool PrintJobRecovery::enabled; // Initialized by settings.load()
 
+#if HAS_PLR_BED_THRESHOLD
+  celsius_t PrintJobRecovery::bed_temp_threshold; // Initialized by settings.load()
+#endif
+
 MediaFile PrintJobRecovery::file;
 job_recovery_info_t PrintJobRecovery::info;
 const char PrintJobRecovery::filename[5] = "/PLR";

Marlin/src/feature/powerloss.h

@@ -175,6 +175,10 @@ class PrintJobRecovery {
     static void enable(const bool onoff);
     static void changed();
 
+    #if HAS_PLR_BED_THRESHOLD
+      static celsius_t bed_temp_threshold;
+    #endif
+
     static bool exists() { return card.jobRecoverFileExists(); }
     static void open(const bool read) { card.openJobRecoveryFile(read); }
     static void close() { file.close(); }

Marlin/src/gcode/feature/powerloss/M1000.cpp

@@ -28,6 +28,10 @@
 #include "../../../feature/powerloss.h"
 #include "../../../module/motion.h"
 
+#if HAS_PLR_BED_THRESHOLD
+  #include "../../../module/temperature.h"  // for degBed
+#endif
+
 #include "../../../lcd/marlinui.h"
 #if ENABLED(EXTENSIBLE_UI)
   #include "../../../lcd/extui/ui_api.h"
@@ -60,12 +64,15 @@ inline void plr_error(FSTR_P const prefix) {
 /**
  * M1000: Resume from power-loss (undocumented)
  *   - With 'S' go to the Resume/Cancel menu
+ *     ...unless the bed temperature is already above a configured minimum temperature.
  *   - With no parameters, run recovery commands
  */
 void GcodeSuite::M1000() {
 
   if (recovery.valid()) {
-    if (parser.seen_test('S')) {
+    const bool force_resume = TERN0(HAS_PLR_BED_THRESHOLD, recovery.bed_temp_threshold && (thermalManager.degBed() >= recovery.bed_temp_threshold));
+
+    if (!force_resume && parser.seen_test('S')) {
       #if HAS_MARLINUI_MENU
         ui.goto_screen(menu_job_recovery);
       #elif HAS_DWIN_E3V2_BASIC

Marlin/src/gcode/feature/powerloss/M413.cpp

@@ -35,6 +35,9 @@
  * Parameters
  *   S[bool] - Flag to enable / disable.
  *             If omitted, report current state.
+ *
+ * With PLR_BED_THRESHOLD:
+ *   B         Bed Temperature above which recovery will proceed without asking permission.
  */
 void GcodeSuite::M413() {
 
@@ -43,6 +46,11 @@ void GcodeSuite::M413() {
   else
     M413_report();
 
+  #if HAS_PLR_BED_THRESHOLD
+    if (parser.seenval('B'))
+      recovery.bed_temp_threshold = parser.value_celsius();
+  #endif
+
   #if ENABLED(DEBUG_POWER_LOSS_RECOVERY)
     if (parser.seen("RL")) recovery.load();
     if (parser.seen_test('W')) recovery.save(true);
@@ -57,7 +65,11 @@ void GcodeSuite::M413() {
 
 void GcodeSuite::M413_report(const bool forReplay/*=true*/) {
   report_heading_etc(forReplay, F(STR_POWER_LOSS_RECOVERY));
-  SERIAL_ECHOPGM("  M413 S", AS_DIGIT(recovery.enabled), " ; ");
+  SERIAL_ECHOPGM("  M413 S", AS_DIGIT(recovery.enabled)
+    #if HAS_PLR_BED_THRESHOLD
+      , " B", recovery.bed_temp_threshold
+    #endif
+  );
   serialprintln_onoff(recovery.enabled);
 }
 

Marlin/src/inc/Conditionals_adv.h

@@ -1355,3 +1355,8 @@
 #if DISABLED(INCH_MODE_SUPPORT)
   #undef MANUAL_MOVE_DISTANCE_IN
 #endif
+
+// Power-Loss Recovery
+#if ENABLED(POWER_LOSS_RECOVERY) && defined(PLR_BED_THRESHOLD)
+  #define HAS_PLR_BED_THRESHOLD 1
+#endif

Marlin/src/lcd/language/language_en.h

@@ -501,6 +501,7 @@ namespace LanguageNarrow_en {
   LSTR MSG_RESUME_PRINT                   = _UxGT("Resume Print");
   LSTR MSG_STOP_PRINT                     = _UxGT("Stop Print");
   LSTR MSG_OUTAGE_RECOVERY                = _UxGT("Power Outage");
+  LSTR MSG_RESUME_BED_TEMP                = _UxGT("Resume Bed Temp");
   LSTR MSG_HOST_START_PRINT               = _UxGT("Host Start");
   LSTR MSG_PRINTING_OBJECT                = _UxGT("Print Obj");
   LSTR MSG_CANCEL_OBJECT                  = _UxGT("Cancel Obj");

Marlin/src/lcd/menu/menu_configuration.cpp

@@ -640,6 +640,9 @@ void menu_configuration() {
 
   #if ENABLED(POWER_LOSS_RECOVERY)
     EDIT_ITEM(bool, MSG_OUTAGE_RECOVERY, &recovery.enabled, recovery.changed);
+    #if HAS_PLR_BED_THRESHOLD
+      EDIT_ITEM(int3, MSG_RESUME_BED_TEMP, &recovery.bed_temp_threshold, 0, BED_MAX_TARGET);
+    #endif
   #endif
 
   // Preheat configurations

Marlin/src/module/settings.cpp

@@ -444,6 +444,7 @@ typedef struct SettingsDataStruct {
   // POWER_LOSS_RECOVERY
   //
   bool recovery_enabled;                                // M413 S
+  celsius_t bed_temp_threshold;                         // M413 B
 
   //
   // FWRETRACT
@@ -1268,8 +1269,10 @@ void MarlinSettings::postprocess() {
     //
     {
       _FIELD_TEST(recovery_enabled);
-      const bool recovery_enabled = TERN(POWER_LOSS_RECOVERY, recovery.enabled, ENABLED(PLR_ENABLED_DEFAULT));
+      const bool recovery_enabled = TERN0(POWER_LOSS_RECOVERY, recovery.enabled);
+      const celsius_t bed_temp_threshold = TERN0(HAS_PLR_BED_THRESHOLD, recovery.bed_temp_threshold);
       EEPROM_WRITE(recovery_enabled);
+      EEPROM_WRITE(bed_temp_threshold);
     }
 
     //
@@ -2310,10 +2313,15 @@ void MarlinSettings::postprocess() {
       // Power-Loss Recovery
       //
       {
-        bool recovery_enabled;
         _FIELD_TEST(recovery_enabled);
+        bool recovery_enabled;
+        celsius_t bed_temp_threshold;
         EEPROM_READ(recovery_enabled);
-        TERN_(POWER_LOSS_RECOVERY, if (!validating) recovery.enabled = recovery_enabled);
+        EEPROM_READ(bed_temp_threshold);
+        if (!validating) {
+          TERN_(POWER_LOSS_RECOVERY, recovery.enabled = recovery_enabled);
+          TERN_(HAS_PLR_BED_THRESHOLD, recovery.bed_temp_threshold = bed_temp_threshold);
+        }
       }
 
       //
@@ -3460,7 +3468,10 @@ void MarlinSettings::reset() {
   //
   // Power-Loss Recovery
   //
-  TERN_(POWER_LOSS_RECOVERY, recovery.enable(ENABLED(PLR_ENABLED_DEFAULT)));
+  #if ENABLED(POWER_LOSS_RECOVERY)
+    recovery.enable(ENABLED(PLR_ENABLED_DEFAULT));
+    TERN_(HAS_PLR_BED_THRESHOLD, recovery.bed_temp_threshold = PLR_BED_THRESHOLD);
+  #endif
 
   //
   // Firmware Retraction