Improve BLTOUCH_HEATERS_OFF functionality

- rename to PROBING_HEATERS_OFF
 - move heater pausing functionality into thermalManager
   - add variables, pause(), ispaused(), other functions
 - add fan pausing functionality -> PROBING_FANS_OFF
 - add probing_pause() wrapper
 - move pausing into do_homing_move() and do_probe_move() to minimize quiet time and so other probe types can benefit
 - example configs

Marlin/Conditionals_post.h

@@ -645,6 +645,15 @@
   #endif
   #define WRITE_FAN_N(n, v) WRITE_FAN##n(v)
 
+
+  /**
+   * Heater & Fan Pausing
+   */
+  #if ENABLED(PROBING_FANS_OFF) && FAN_COUNT == 0
+    #undef PROBING_FANS_OFF
+  #endif
+  #define QUIET_PROBING (ENABLED(PROBING_HEATERS_OFF) || ENABLED(PROBING_FANS_OFF))
+
   /**
    * Servos and probes
    */

Marlin/Configuration.h

@@ -584,14 +584,23 @@
 //#define Z_SERVO_ANGLES {70,0}  // Z Servo Deploy and Stow angles
 
 /**
- * The BLTouch probe is a Hall effect sensor that emulates a servo.
+ * The BLTouch probe uses a Hall effect sensor and emulates a servo.
  */
 //#define BLTOUCH
 #if ENABLED(BLTOUCH)
   //#define BLTOUCH_DELAY 375   // (ms) Enable and increase if needed
-  //#define BLTOUCH_HEATERS_OFF // Enable if the probe seems unreliable. Heaters will be disabled for each probe.
 #endif
 
+/**
+ * Enable if probing seems unreliable. Heaters and/or fans - consistent with the
+ * options selected below - will be disabled during probing so as to minimize
+ * potential EM interference by quieting/silencing the source of the 'noise' (the change
+ * in current flowing through the wires).  This is likely most useful to users of the
+ * BLTouch probe, but may also help those with inductive or other probe types.
+ */
+//#define PROBING_HEATERS_OFF       // Turn heaters off when probing
+//#define PROBING_FANS_OFF          // Turn fans off when probing
+
 // A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
 //#define SOLENOID_PROBE
 

Marlin/Marlin.h

@@ -362,6 +362,10 @@ int16_t code_value_temp_diff();
 
 #if FAN_COUNT > 0
   extern int16_t fanSpeeds[FAN_COUNT];
+  #if ENABLED(PROBING_FANS_OFF)
+    extern bool fans_paused;
+    extern int16_t paused_fanSpeeds[FAN_COUNT];
+  #endif
 #endif
 
 #if ENABLED(BARICUDA)

Marlin/Marlin_main.cpp

@@ -441,6 +441,10 @@ float soft_endstop_min[XYZ] = { X_MIN_POS, Y_MIN_POS, Z_MIN_POS },
 
 #if FAN_COUNT > 0
   int16_t fanSpeeds[FAN_COUNT] = { 0 };
+  #if ENABLED(PROBING_FANS_OFF)
+    bool fans_paused = false;
+    int16_t paused_fanSpeeds[FAN_COUNT] = { 0 };
+  #endif
 #endif
 
 // The active extruder (tool). Set with T<extruder> command.
@@ -2041,6 +2045,35 @@ static void clean_up_after_endstop_or_probe_move() {
 
 #endif
 
+#if ENABLED(PROBING_FANS_OFF)
+  void fans_pause(bool p) {
+    if (p && fans_paused) { // If called out of order something is wrong
+      SERIAL_ERROR_START;
+      SERIAL_ERRORLNPGM("Fans already paused!");
+      return;
+    }
+
+    if (!p && !fans_paused) {
+      SERIAL_ERROR_START;
+      SERIAL_ERRORLNPGM("Fans already unpaused!");
+      return;
+    }
+
+    if (p) {
+      for (uint8_t x = 0;x < FAN_COUNT;x++) {
+        paused_fanSpeeds[x] = fanSpeeds[x];
+        fanSpeeds[x] = 0;
+      }
+    }
+    else {
+      for (uint8_t x = 0;x < FAN_COUNT;x++)
+        fanSpeeds[x] = paused_fanSpeeds[x];
+    }
+
+    fans_paused = p;
+  }
+#endif
+
 #if HAS_BED_PROBE
 
   // TRIGGERED_WHEN_STOWED_TEST can easily be extended to servo probes, ... if needed.
@@ -2052,6 +2085,20 @@ static void clean_up_after_endstop_or_probe_move() {
     #endif
   #endif
 
+  #if QUIET_PROBING
+    void probing_pause(bool pause) {
+      #if ENABLED(PROBING_HEATERS_OFF)
+        thermalManager.pause(pause);
+      #endif
+
+      #if ENABLED(PROBING_FANS_OFF)
+        fans_pause(pause);
+      #endif
+
+      if(pause) safe_delay(25);
+    }
+  #endif
+
   #if ENABLED(BLTOUCH)
 
     void bltouch_command(int angle) {
@@ -2059,51 +2106,6 @@ static void clean_up_after_endstop_or_probe_move() {
       safe_delay(BLTOUCH_DELAY);
     }
 
-    /**
-     * BLTouch probes have a Hall effect sensor. The high currents switching
-     * on and off cause a magnetic field that can affect the repeatability of the
-     * sensor. So for BLTouch probes, heaters are turned off during the probe,
-     * then quickly turned back on after the point is sampled.
-     */
-    #if ENABLED(BLTOUCH_HEATERS_OFF)
-
-      void set_heaters_for_bltouch(const bool deploy) {
-        static bool heaters_were_disabled = false;
-        static millis_t next_emi_protection = 0;
-        static int16_t temps_at_entry[HOTENDS];
-
-        #if HAS_TEMP_BED
-          static int16_t bed_temp_at_entry;
-        #endif
-
-        // If called out of order or far apart something is seriously wrong
-        if (deploy == heaters_were_disabled
-            || (next_emi_protection && ELAPSED(millis(), next_emi_protection)))
-          kill(PSTR(MSG_KILLED));
-
-        if (deploy) {
-          next_emi_protection = millis() + 20 * 1000UL;
-          HOTEND_LOOP() {
-            temps_at_entry[e] = thermalManager.degTargetHotend(e);
-            thermalManager.setTargetHotend(0, e);
-          }
-          #if HAS_TEMP_BED
-            bed_temp_at_entry = thermalManager.degTargetBed();
-            thermalManager.setTargetBed(0);
-          #endif
-        }
-        else {
-          next_emi_protection = 0;
-          HOTEND_LOOP() thermalManager.setTargetHotend(temps_at_entry[e], e);
-          #if HAS_TEMP_BED
-            thermalManager.setTargetBed(bed_temp_at_entry);
-          #endif
-        }
-        heaters_were_disabled = deploy;
-      }
-
-    #endif // BLTOUCH_HEATERS_OFF
-
     void set_bltouch_deployed(const bool deploy) {
       if (deploy && TEST_BLTOUCH()) {      // If BL-Touch says it's triggered
         bltouch_command(BLTOUCH_RESET);    //  try to reset it.
@@ -2118,9 +2120,6 @@ static void clean_up_after_endstop_or_probe_move() {
           stop();                          // punt!
         }
       }
-      #if ENABLED(BLTOUCH_HEATERS_OFF)
-        set_heaters_for_bltouch(deploy);
-      #endif
 
       bltouch_command(deploy ? BLTOUCH_DEPLOY : BLTOUCH_STOW);
 
@@ -2249,9 +2248,17 @@ static void clean_up_after_endstop_or_probe_move() {
       set_bltouch_deployed(true);
     #endif
 
+    #if QUIET_PROBING
+      probing_pause(true);
+    #endif
+
     // Move down until probe triggered
     do_blocking_move_to_z(LOGICAL_Z_POSITION(z), MMM_TO_MMS(fr_mm_m));
 
+    #if QUIET_PROBING
+      probing_pause(false);
+    #endif
+
     // Retract BLTouch immediately after a probe
     #if ENABLED(BLTOUCH)
       set_bltouch_deployed(false);
@@ -2809,6 +2816,10 @@ static void do_homing_move(const AxisEnum axis, float distance, float fr_mm_s=0.
     if (deploy_bltouch) set_bltouch_deployed(true);
   #endif
 
+  #if QUIET_PROBING
+    if (axis == Z_AXIS) probing_pause(true);
+  #endif
+
   // Tell the planner we're at Z=0
   current_position[axis] = 0;
 
@@ -2825,6 +2836,10 @@ static void do_homing_move(const AxisEnum axis, float distance, float fr_mm_s=0.
 
   stepper.synchronize();
 
+  #if QUIET_PROBING
+    if (axis == Z_AXIS) probing_pause(false);
+  #endif
+
   #if HOMING_Z_WITH_PROBE && ENABLED(BLTOUCH)
     if (deploy_bltouch) set_bltouch_deployed(false);
   #endif
@@ -6468,6 +6483,7 @@ inline void gcode_M104() {
   if (code_seen('S')) {
     const int16_t temp = code_value_temp_abs();
     thermalManager.setTargetHotend(temp, target_extruder);
+
     #if ENABLED(DUAL_X_CARRIAGE)
       if (dual_x_carriage_mode == DXC_DUPLICATION_MODE && target_extruder == 0)
         thermalManager.setTargetHotend(temp ? temp + duplicate_extruder_temp_offset : 0, 1);
@@ -6663,6 +6679,7 @@ inline void gcode_M109() {
   if (no_wait_for_cooling || code_seen('R')) {
     const int16_t temp = code_value_temp_abs();
     thermalManager.setTargetHotend(temp, target_extruder);
+
     #if ENABLED(DUAL_X_CARRIAGE)
       if (dual_x_carriage_mode == DXC_DUPLICATION_MODE && target_extruder == 0)
         thermalManager.setTargetHotend(temp ? temp + duplicate_extruder_temp_offset : 0, 1);
@@ -6814,6 +6831,7 @@ inline void gcode_M109() {
     const bool no_wait_for_cooling = code_seen('S');
     if (no_wait_for_cooling || code_seen('R')) {
       thermalManager.setTargetBed(code_value_temp_abs());
+
       #if ENABLED(PRINTJOB_TIMER_AUTOSTART)
         if (code_value_temp_abs() > BED_MINTEMP)
           print_job_timer.start();
@@ -7107,10 +7125,11 @@ inline void gcode_M81() {
   thermalManager.disable_all_heaters();
   stepper.finish_and_disable();
   #if FAN_COUNT > 0
-    #if FAN_COUNT > 1
+    for (uint8_t i = 0; i < FAN_COUNT; i++) fanSpeeds[i] = 0;
-      for (uint8_t i = 0; i < FAN_COUNT; i++) fanSpeeds[i] = 0;
+
-    #else
+    #if ENABLED(PROBING_FANS_OFF)
-      fanSpeeds[0] = 0;
+      fans_paused = false;
+      ZERO(paused_fanSpeeds);
     #endif
   #endif
   safe_delay(1000); // Wait 1 second before switching off
@@ -12087,7 +12106,12 @@ void kill(const char* lcd_msg) {
  * After a stop the machine may be resumed with M999
  */
 void stop() {
-  thermalManager.disable_all_heaters();
+  thermalManager.disable_all_heaters(); // 'unpause' taken care of in here
+
+  #if ENABLED(PROBING_FANS_OFF)
+    if (fans_paused) fans_pause(false); // put things back the way they were
+  #endif
+
   if (IsRunning()) {
     Stopped_gcode_LastN = gcode_LastN; // Save last g_code for restart
     SERIAL_ERROR_START;

Marlin/example_configurations/Cartesio/Configuration.h

@@ -582,14 +582,23 @@
 //#define Z_SERVO_ANGLES {70,0}  // Z Servo Deploy and Stow angles
 
 /**
- * The BLTouch probe is a Hall effect sensor that emulates a servo.
+ * The BLTouch probe uses a Hall effect sensor and emulates a servo.
  */
 //#define BLTOUCH
 #if ENABLED(BLTOUCH)
   //#define BLTOUCH_DELAY 375   // (ms) Enable and increase if needed
-  //#define BLTOUCH_HEATERS_OFF // Enable if the probe seems unreliable. Heaters will be disabled for each probe.
 #endif
 
+/**
+ * Enable if probing seems unreliable. Heaters and/or fans - consistent with the
+ * options selected below - will be disabled during probing so as to minimize
+ * potential EM interference by quieting/silencing the source of the 'noise' (the change
+ * in current flowing through the wires).  This is likely most useful to users of the
+ * BLTouch probe, but may also help those with inductive or other probe types.
+ */
+//#define PROBING_HEATERS_OFF       // Turn heaters off when probing
+//#define PROBING_FANS_OFF          // Turn fans off when probing
+
 // A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
 //#define SOLENOID_PROBE
 

Marlin/example_configurations/Felix/Configuration.h

@@ -566,14 +566,23 @@
 //#define Z_SERVO_ANGLES {70,0}  // Z Servo Deploy and Stow angles
 
 /**
- * The BLTouch probe is a Hall effect sensor that emulates a servo.
+ * The BLTouch probe uses a Hall effect sensor and emulates a servo.
  */
 //#define BLTOUCH
 #if ENABLED(BLTOUCH)
   //#define BLTOUCH_DELAY 375   // (ms) Enable and increase if needed
-  //#define BLTOUCH_HEATERS_OFF // Enable if the probe seems unreliable. Heaters will be disabled for each probe.
 #endif
 
+/**
+ * Enable if probing seems unreliable. Heaters and/or fans - consistent with the
+ * options selected below - will be disabled during probing so as to minimize
+ * potential EM interference by quieting/silencing the source of the 'noise' (the change
+ * in current flowing through the wires).  This is likely most useful to users of the
+ * BLTouch probe, but may also help those with inductive or other probe types.
+ */
+//#define PROBING_HEATERS_OFF       // Turn heaters off when probing
+//#define PROBING_FANS_OFF          // Turn fans off when probing
+
 // A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
 //#define SOLENOID_PROBE
 

Marlin/example_configurations/Felix/DUAL/Configuration.h

@@ -566,14 +566,23 @@
 //#define Z_SERVO_ANGLES {70,0}  // Z Servo Deploy and Stow angles
 
 /**
- * The BLTouch probe is a Hall effect sensor that emulates a servo.
+ * The BLTouch probe uses a Hall effect sensor and emulates a servo.
  */
 //#define BLTOUCH
 #if ENABLED(BLTOUCH)
   //#define BLTOUCH_DELAY 375   // (ms) Enable and increase if needed
-  //#define BLTOUCH_HEATERS_OFF // Enable if the probe seems unreliable. Heaters will be disabled for each probe.
 #endif
 
+/**
+ * Enable if probing seems unreliable. Heaters and/or fans - consistent with the
+ * options selected below - will be disabled during probing so as to minimize
+ * potential EM interference by quieting/silencing the source of the 'noise' (the change
+ * in current flowing through the wires).  This is likely most useful to users of the
+ * BLTouch probe, but may also help those with inductive or other probe types.
+ */
+//#define PROBING_HEATERS_OFF       // Turn heaters off when probing
+//#define PROBING_FANS_OFF          // Turn fans off when probing
+
 // A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
 //#define SOLENOID_PROBE
 

Marlin/example_configurations/FolgerTech-i3-2020/Configuration.h

@@ -590,14 +590,23 @@
 #define Z_SERVO_ANGLES {40,85}  // Z Servo Deploy and Stow angles
 
 /**
- * The BLTouch probe is a Hall effect sensor that emulates a servo.
+ * The BLTouch probe uses a Hall effect sensor and emulates a servo.
  */
 //#define BLTOUCH
 #if ENABLED(BLTOUCH)
   //#define BLTOUCH_DELAY 375   // (ms) Enable and increase if needed
-  //#define BLTOUCH_HEATERS_OFF // Enable if the probe seems unreliable. Heaters will be disabled for each probe.
 #endif
 
+/**
+ * Enable if probing seems unreliable. Heaters and/or fans - consistent with the
+ * options selected below - will be disabled during probing so as to minimize
+ * potential EM interference by quieting/silencing the source of the 'noise' (the change
+ * in current flowing through the wires).  This is likely most useful to users of the
+ * BLTouch probe, but may also help those with inductive or other probe types.
+ */
+//#define PROBING_HEATERS_OFF       // Turn heaters off when probing
+//#define PROBING_FANS_OFF          // Turn fans off when probing
+
 // A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
 //#define SOLENOID_PROBE
 

Marlin/example_configurations/Hephestos/Configuration.h

@@ -574,14 +574,23 @@
 //#define Z_SERVO_ANGLES {70,0}  // Z Servo Deploy and Stow angles
 
 /**
- * The BLTouch probe is a Hall effect sensor that emulates a servo.
+ * The BLTouch probe uses a Hall effect sensor and emulates a servo.
  */
 //#define BLTOUCH
 #if ENABLED(BLTOUCH)
   //#define BLTOUCH_DELAY 375   // (ms) Enable and increase if needed
-  //#define BLTOUCH_HEATERS_OFF // Enable if the probe seems unreliable. Heaters will be disabled for each probe.
 #endif
 
+/**
+ * Enable if probing seems unreliable. Heaters and/or fans - consistent with the
+ * options selected below - will be disabled during probing so as to minimize
+ * potential EM interference by quieting/silencing the source of the 'noise' (the change
+ * in current flowing through the wires).  This is likely most useful to users of the
+ * BLTouch probe, but may also help those with inductive or other probe types.
+ */
+//#define PROBING_HEATERS_OFF       // Turn heaters off when probing
+//#define PROBING_FANS_OFF          // Turn fans off when probing
+
 // A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
 //#define SOLENOID_PROBE
 

Marlin/example_configurations/Hephestos_2/Configuration.h

@@ -577,14 +577,23 @@
 //#define Z_SERVO_ANGLES {70,0}  // Z Servo Deploy and Stow angles
 
 /**
- * The BLTouch probe is a Hall effect sensor that emulates a servo.
+ * The BLTouch probe uses a Hall effect sensor and emulates a servo.
  */
 //#define BLTOUCH
 #if ENABLED(BLTOUCH)
   //#define BLTOUCH_DELAY 375   // (ms) Enable and increase if needed
-  //#define BLTOUCH_HEATERS_OFF // Enable if the probe seems unreliable. Heaters will be disabled for each probe.
 #endif
 
+/**
+ * Enable if probing seems unreliable. Heaters and/or fans - consistent with the
+ * options selected below - will be disabled during probing so as to minimize
+ * potential EM interference by quieting/silencing the source of the 'noise' (the change
+ * in current flowing through the wires).  This is likely most useful to users of the
+ * BLTouch probe, but may also help those with inductive or other probe types.
+ */
+//#define PROBING_HEATERS_OFF       // Turn heaters off when probing
+//#define PROBING_FANS_OFF          // Turn fans off when probing
+
 // A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
 //#define SOLENOID_PROBE
 

Marlin/example_configurations/K8200/Configuration.h

@@ -612,14 +612,23 @@
 //#define Z_SERVO_ANGLES {70,0}  // Z Servo Deploy and Stow angles
 
 /**
- * The BLTouch probe is a Hall effect sensor that emulates a servo.
+ * The BLTouch probe uses a Hall effect sensor and emulates a servo.
  */
 //#define BLTOUCH
 #if ENABLED(BLTOUCH)
   //#define BLTOUCH_DELAY 375   // (ms) Enable and increase if needed
-  //#define BLTOUCH_HEATERS_OFF // Enable if the probe seems unreliable. Heaters will be disabled for each probe.
 #endif
 
+/**
+ * Enable if probing seems unreliable. Heaters and/or fans - consistent with the
+ * options selected below - will be disabled during probing so as to minimize
+ * potential EM interference by quieting/silencing the source of the 'noise' (the change
+ * in current flowing through the wires).  This is likely most useful to users of the
+ * BLTouch probe, but may also help those with inductive or other probe types.
+ */
+//#define PROBING_HEATERS_OFF       // Turn heaters off when probing
+//#define PROBING_FANS_OFF          // Turn fans off when probing
+
 // A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
 //#define SOLENOID_PROBE
 

Marlin/example_configurations/K8400/Configuration.h

@@ -583,14 +583,23 @@
 //#define Z_SERVO_ANGLES {70,0}  // Z Servo Deploy and Stow angles
 
 /**
- * The BLTouch probe is a Hall effect sensor that emulates a servo.
+ * The BLTouch probe uses a Hall effect sensor and emulates a servo.
  */
 //#define BLTOUCH
 #if ENABLED(BLTOUCH)
   //#define BLTOUCH_DELAY 375   // (ms) Enable and increase if needed
-  //#define BLTOUCH_HEATERS_OFF // Enable if the probe seems unreliable. Heaters will be disabled for each probe.
 #endif
 
+/**
+ * Enable if probing seems unreliable. Heaters and/or fans - consistent with the
+ * options selected below - will be disabled during probing so as to minimize
+ * potential EM interference by quieting/silencing the source of the 'noise' (the change
+ * in current flowing through the wires).  This is likely most useful to users of the
+ * BLTouch probe, but may also help those with inductive or other probe types.
+ */
+//#define PROBING_HEATERS_OFF       // Turn heaters off when probing
+//#define PROBING_FANS_OFF          // Turn fans off when probing
+
 // A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
 //#define SOLENOID_PROBE
 

Marlin/example_configurations/K8400/Dual-head/Configuration.h

@@ -583,14 +583,23 @@
 //#define Z_SERVO_ANGLES {70,0}  // Z Servo Deploy and Stow angles
 
 /**
- * The BLTouch probe is a Hall effect sensor that emulates a servo.
+ * The BLTouch probe uses a Hall effect sensor and emulates a servo.
  */
 //#define BLTOUCH
 #if ENABLED(BLTOUCH)
   //#define BLTOUCH_DELAY 375   // (ms) Enable and increase if needed
-  //#define BLTOUCH_HEATERS_OFF // Enable if the probe seems unreliable. Heaters will be disabled for each probe.
 #endif
 
+/**
+ * Enable if probing seems unreliable. Heaters and/or fans - consistent with the
+ * options selected below - will be disabled during probing so as to minimize
+ * potential EM interference by quieting/silencing the source of the 'noise' (the change
+ * in current flowing through the wires).  This is likely most useful to users of the
+ * BLTouch probe, but may also help those with inductive or other probe types.
+ */
+//#define PROBING_HEATERS_OFF       // Turn heaters off when probing
+//#define PROBING_FANS_OFF          // Turn fans off when probing
+
 // A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
 //#define SOLENOID_PROBE
 

Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h

@@ -583,14 +583,23 @@
 //#define Z_SERVO_ANGLES {70,0}  // Z Servo Deploy and Stow angles
 
 /**
- * The BLTouch probe is a Hall effect sensor that emulates a servo.
+ * The BLTouch probe uses a Hall effect sensor and emulates a servo.
  */
 //#define BLTOUCH
 #if ENABLED(BLTOUCH)
   //#define BLTOUCH_DELAY 375   // (ms) Enable and increase if needed
-  //#define BLTOUCH_HEATERS_OFF // Enable if the probe seems unreliable. Heaters will be disabled for each probe.
 #endif
 
+/**
+ * Enable if probing seems unreliable. Heaters and/or fans - consistent with the
+ * options selected below - will be disabled during probing so as to minimize
+ * potential EM interference by quieting/silencing the source of the 'noise' (the change
+ * in current flowing through the wires).  This is likely most useful to users of the
+ * BLTouch probe, but may also help those with inductive or other probe types.
+ */
+//#define PROBING_HEATERS_OFF       // Turn heaters off when probing
+//#define PROBING_FANS_OFF          // Turn fans off when probing
+
 // A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
 //#define SOLENOID_PROBE
 

Marlin/example_configurations/RigidBot/Configuration.h

@@ -582,14 +582,23 @@
 //#define Z_SERVO_ANGLES {70,0}  // Z Servo Deploy and Stow angles
 
 /**
- * The BLTouch probe is a Hall effect sensor that emulates a servo.
+ * The BLTouch probe uses a Hall effect sensor and emulates a servo.
  */
 //#define BLTOUCH
 #if ENABLED(BLTOUCH)
   //#define BLTOUCH_DELAY 375   // (ms) Enable and increase if needed
-  //#define BLTOUCH_HEATERS_OFF // Enable if the probe seems unreliable. Heaters will be disabled for each probe.
 #endif
 
+/**
+ * Enable if probing seems unreliable. Heaters and/or fans - consistent with the
+ * options selected below - will be disabled during probing so as to minimize
+ * potential EM interference by quieting/silencing the source of the 'noise' (the change
+ * in current flowing through the wires).  This is likely most useful to users of the
+ * BLTouch probe, but may also help those with inductive or other probe types.
+ */
+//#define PROBING_HEATERS_OFF       // Turn heaters off when probing
+//#define PROBING_FANS_OFF          // Turn fans off when probing
+
 // A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
 //#define SOLENOID_PROBE
 

Marlin/example_configurations/SCARA/Configuration.h

@@ -598,14 +598,23 @@
 //#define Z_SERVO_ANGLES {70,0}  // Z Servo Deploy and Stow angles
 
 /**
- * The BLTouch probe is a Hall effect sensor that emulates a servo.
+ * The BLTouch probe uses a Hall effect sensor and emulates a servo.
  */
 //#define BLTOUCH
 #if ENABLED(BLTOUCH)
   //#define BLTOUCH_DELAY 375   // (ms) Enable and increase if needed
-  //#define BLTOUCH_HEATERS_OFF // Enable if the probe seems unreliable. Heaters will be disabled for each probe.
 #endif
 
+/**
+ * Enable if probing seems unreliable. Heaters and/or fans - consistent with the
+ * options selected below - will be disabled during probing so as to minimize
+ * potential EM interference by quieting/silencing the source of the 'noise' (the change
+ * in current flowing through the wires).  This is likely most useful to users of the
+ * BLTouch probe, but may also help those with inductive or other probe types.
+ */
+//#define PROBING_HEATERS_OFF       // Turn heaters off when probing
+//#define PROBING_FANS_OFF          // Turn fans off when probing
+
 // A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
 //#define SOLENOID_PROBE
 

Marlin/example_configurations/TAZ4/Configuration.h

@@ -603,14 +603,23 @@
 //#define Z_SERVO_ANGLES {70,0}  // Z Servo Deploy and Stow angles
 
 /**
- * The BLTouch probe is a Hall effect sensor that emulates a servo.
+ * The BLTouch probe uses a Hall effect sensor and emulates a servo.
  */
 //#define BLTOUCH
 #if ENABLED(BLTOUCH)
   //#define BLTOUCH_DELAY 375   // (ms) Enable and increase if needed
-  //#define BLTOUCH_HEATERS_OFF // Enable if the probe seems unreliable. Heaters will be disabled for each probe.
 #endif
 
+/**
+ * Enable if probing seems unreliable. Heaters and/or fans - consistent with the
+ * options selected below - will be disabled during probing so as to minimize
+ * potential EM interference by quieting/silencing the source of the 'noise' (the change
+ * in current flowing through the wires).  This is likely most useful to users of the
+ * BLTouch probe, but may also help those with inductive or other probe types.
+ */
+//#define PROBING_HEATERS_OFF       // Turn heaters off when probing
+//#define PROBING_FANS_OFF          // Turn fans off when probing
+
 // A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
 //#define SOLENOID_PROBE
 

Marlin/example_configurations/TinyBoy2/Configuration.h

@@ -634,14 +634,23 @@
 //#define Z_SERVO_ANGLES {70,0}  // Z Servo Deploy and Stow angles
 
 /**
- * The BLTouch probe is a Hall effect sensor that emulates a servo.
+ * The BLTouch probe uses a Hall effect sensor and emulates a servo.
  */
 //#define BLTOUCH
 #if ENABLED(BLTOUCH)
   //#define BLTOUCH_DELAY 375   // (ms) Enable and increase if needed
-  //#define BLTOUCH_HEATERS_OFF // Enable if the probe seems unreliable. Heaters will be disabled for each probe.
 #endif
 
+/**
+ * Enable if probing seems unreliable. Heaters and/or fans - consistent with the
+ * options selected below - will be disabled during probing so as to minimize
+ * potential EM interference by quieting/silencing the source of the 'noise' (the change
+ * in current flowing through the wires).  This is likely most useful to users of the
+ * BLTouch probe, but may also help those with inductive or other probe types.
+ */
+//#define PROBING_HEATERS_OFF       // Turn heaters off when probing
+//#define PROBING_FANS_OFF          // Turn fans off when probing
+
 // A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
 //#define SOLENOID_PROBE
 

Marlin/example_configurations/WITBOX/Configuration.h

@@ -574,14 +574,23 @@
 //#define Z_SERVO_ANGLES {70,0}  // Z Servo Deploy and Stow angles
 
 /**
- * The BLTouch probe is a Hall effect sensor that emulates a servo.
+ * The BLTouch probe uses a Hall effect sensor and emulates a servo.
  */
 //#define BLTOUCH
 #if ENABLED(BLTOUCH)
   //#define BLTOUCH_DELAY 375   // (ms) Enable and increase if needed
-  //#define BLTOUCH_HEATERS_OFF // Enable if the probe seems unreliable. Heaters will be disabled for each probe.
 #endif
 
+/**
+ * Enable if probing seems unreliable. Heaters and/or fans - consistent with the
+ * options selected below - will be disabled during probing so as to minimize
+ * potential EM interference by quieting/silencing the source of the 'noise' (the change
+ * in current flowing through the wires).  This is likely most useful to users of the
+ * BLTouch probe, but may also help those with inductive or other probe types.
+ */
+//#define PROBING_HEATERS_OFF       // Turn heaters off when probing
+//#define PROBING_FANS_OFF          // Turn fans off when probing
+
 // A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
 //#define SOLENOID_PROBE
 

Marlin/example_configurations/adafruit/ST7565/Configuration.h

@@ -583,14 +583,23 @@
 //#define Z_SERVO_ANGLES {70,0}  // Z Servo Deploy and Stow angles
 
 /**
- * The BLTouch probe is a Hall effect sensor that emulates a servo.
+ * The BLTouch probe uses a Hall effect sensor and emulates a servo.
  */
 //#define BLTOUCH
 #if ENABLED(BLTOUCH)
   //#define BLTOUCH_DELAY 375   // (ms) Enable and increase if needed
-  //#define BLTOUCH_HEATERS_OFF // Enable if the probe seems unreliable. Heaters will be disabled for each probe.
 #endif
 
+/**
+ * Enable if probing seems unreliable. Heaters and/or fans - consistent with the
+ * options selected below - will be disabled during probing so as to minimize
+ * potential EM interference by quieting/silencing the source of the 'noise' (the change
+ * in current flowing through the wires).  This is likely most useful to users of the
+ * BLTouch probe, but may also help those with inductive or other probe types.
+ */
+//#define PROBING_HEATERS_OFF       // Turn heaters off when probing
+//#define PROBING_FANS_OFF          // Turn fans off when probing
+
 // A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
 //#define SOLENOID_PROBE
 

Marlin/example_configurations/delta/FLSUN/auto_calibrate/Configuration.h

@@ -651,14 +651,23 @@
 //#define Z_SERVO_ANGLES {70,0}  // Z Servo Deploy and Stow angles
 
 /**
- * The BLTouch probe is a Hall effect sensor that emulates a servo.
+ * The BLTouch probe uses a Hall effect sensor and emulates a servo.
  */
 //#define BLTOUCH
 #if ENABLED(BLTOUCH)
   //#define BLTOUCH_DELAY 375   // (ms) Enable and increase if needed
-  //#define BLTOUCH_HEATERS_OFF // Enable if the probe seems unreliable. Heaters will be disabled for each probe.
 #endif
 
+/**
+ * Enable if probing seems unreliable. Heaters and/or fans - consistent with the
+ * options selected below - will be disabled during probing so as to minimize
+ * potential EM interference by quieting/silencing the source of the 'noise' (the change
+ * in current flowing through the wires).  This is likely most useful to users of the
+ * BLTouch probe, but may also help those with inductive or other probe types.
+ */
+//#define PROBING_HEATERS_OFF       // Turn heaters off when probing
+//#define PROBING_FANS_OFF          // Turn fans off when probing
+
 // A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
 //#define SOLENOID_PROBE
 

Marlin/example_configurations/delta/FLSUN/kossel_mini/Configuration.h

@@ -658,14 +658,23 @@
 //#define Z_SERVO_ANGLES {70,0}  // Z Servo Deploy and Stow angles
 
 /**
- * The BLTouch probe is a Hall effect sensor that emulates a servo.
+ * The BLTouch probe uses a Hall effect sensor and emulates a servo.
  */
 //#define BLTOUCH
 #if ENABLED(BLTOUCH)
   //#define BLTOUCH_DELAY 375   // (ms) Enable and increase if needed
-  //#define BLTOUCH_HEATERS_OFF // Enable if the probe seems unreliable. Heaters will be disabled for each probe.
 #endif
 
+/**
+ * Enable if probing seems unreliable. Heaters and/or fans - consistent with the
+ * options selected below - will be disabled during probing so as to minimize
+ * potential EM interference by quieting/silencing the source of the 'noise' (the change
+ * in current flowing through the wires).  This is likely most useful to users of the
+ * BLTouch probe, but may also help those with inductive or other probe types.
+ */
+//#define PROBING_HEATERS_OFF       // Turn heaters off when probing
+//#define PROBING_FANS_OFF          // Turn fans off when probing
+
 // A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
 //#define SOLENOID_PROBE
 

Marlin/example_configurations/delta/generic/Configuration.h

@@ -647,14 +647,23 @@
 //#define Z_SERVO_ANGLES {70,0}  // Z Servo Deploy and Stow angles
 
 /**
- * The BLTouch probe is a Hall effect sensor that emulates a servo.
+ * The BLTouch probe uses a Hall effect sensor and emulates a servo.
  */
 //#define BLTOUCH
 #if ENABLED(BLTOUCH)
   //#define BLTOUCH_DELAY 375   // (ms) Enable and increase if needed
-  //#define BLTOUCH_HEATERS_OFF // Enable if the probe seems unreliable. Heaters will be disabled for each probe.
 #endif
 
+/**
+ * Enable if probing seems unreliable. Heaters and/or fans - consistent with the
+ * options selected below - will be disabled during probing so as to minimize
+ * potential EM interference by quieting/silencing the source of the 'noise' (the change
+ * in current flowing through the wires).  This is likely most useful to users of the
+ * BLTouch probe, but may also help those with inductive or other probe types.
+ */
+//#define PROBING_HEATERS_OFF       // Turn heaters off when probing
+//#define PROBING_FANS_OFF          // Turn fans off when probing
+
 // A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
 //#define SOLENOID_PROBE
 

Marlin/example_configurations/delta/kossel_mini/Configuration.h

@@ -642,14 +642,23 @@
 //#define Z_SERVO_ANGLES {70,0}  // Z Servo Deploy and Stow angles
 
 /**
- * The BLTouch probe is a Hall effect sensor that emulates a servo.
+ * The BLTouch probe uses a Hall effect sensor and emulates a servo.
  */
 //#define BLTOUCH
 #if ENABLED(BLTOUCH)
   //#define BLTOUCH_DELAY 375   // (ms) Enable and increase if needed
-  //#define BLTOUCH_HEATERS_OFF // Enable if the probe seems unreliable. Heaters will be disabled for each probe.
 #endif
 
+/**
+ * Enable if probing seems unreliable. Heaters and/or fans - consistent with the
+ * options selected below - will be disabled during probing so as to minimize
+ * potential EM interference by quieting/silencing the source of the 'noise' (the change
+ * in current flowing through the wires).  This is likely most useful to users of the
+ * BLTouch probe, but may also help those with inductive or other probe types.
+ */
+//#define PROBING_HEATERS_OFF       // Turn heaters off when probing
+//#define PROBING_FANS_OFF          // Turn fans off when probing
+
 // A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
 //#define SOLENOID_PROBE
 

Marlin/example_configurations/delta/kossel_pro/Configuration.h

@@ -641,14 +641,23 @@
 //#define Z_SERVO_ANGLES {70,0}  // Z Servo Deploy and Stow angles
 
 /**
- * The BLTouch probe is a Hall effect sensor that emulates a servo.
+ * The BLTouch probe uses a Hall effect sensor and emulates a servo.
  */
 //#define BLTOUCH
 #if ENABLED(BLTOUCH)
   //#define BLTOUCH_DELAY 375   // (ms) Enable and increase if needed
-  //#define BLTOUCH_HEATERS_OFF // Enable if the probe seems unreliable. Heaters will be disabled for each probe.
 #endif
 
+/**
+ * Enable if probing seems unreliable. Heaters and/or fans - consistent with the
+ * options selected below - will be disabled during probing so as to minimize
+ * potential EM interference by quieting/silencing the source of the 'noise' (the change
+ * in current flowing through the wires).  This is likely most useful to users of the
+ * BLTouch probe, but may also help those with inductive or other probe types.
+ */
+//#define PROBING_HEATERS_OFF       // Turn heaters off when probing
+//#define PROBING_FANS_OFF          // Turn fans off when probing
+
 // A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
 //#define SOLENOID_PROBE
 

Marlin/example_configurations/delta/kossel_xl/Configuration.h

@@ -660,14 +660,23 @@
 //#define Z_SERVO_ANGLES {70,0}  // Z Servo Deploy and Stow angles
 
 /**
- * The BLTouch probe is a Hall effect sensor that emulates a servo.
+ * The BLTouch probe uses a Hall effect sensor and emulates a servo.
  */
 //#define BLTOUCH
 #if ENABLED(BLTOUCH)
   //#define BLTOUCH_DELAY 375   // (ms) Enable and increase if needed
-  //#define BLTOUCH_HEATERS_OFF // Enable if the probe seems unreliable. Heaters will be disabled for each probe.
 #endif
 
+/**
+ * Enable if probing seems unreliable. Heaters and/or fans - consistent with the
+ * options selected below - will be disabled during probing so as to minimize
+ * potential EM interference by quieting/silencing the source of the 'noise' (the change
+ * in current flowing through the wires).  This is likely most useful to users of the
+ * BLTouch probe, but may also help those with inductive or other probe types.
+ */
+//#define PROBING_HEATERS_OFF       // Turn heaters off when probing
+//#define PROBING_FANS_OFF          // Turn fans off when probing
+
 // A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
 //#define SOLENOID_PROBE
 

Marlin/example_configurations/gCreate_gMax1.5+/Configuration.h

@@ -569,11 +569,22 @@
 //#define Z_SERVO_ANGLES {70,0}  // Z Servo Deploy and Stow angles
 
 /**
- * The BLTouch probe is a Hall effect sensor that emulates a servo.
+ * The BLTouch probe uses a Hall effect sensor and emulates a servo.
  */
 #define BLTOUCH
-#define BLTOUCH_DELAY 500   // (ms) Enable and increase if needed
+#if ENABLED(BLTOUCH)
-#define BLTOUCH_HEATERS_OFF // if defined the printer's heaters are turned off during probe event
+  #define BLTOUCH_DELAY 500   // (ms) Enable and increase if needed
+#endif
+
+/**
+ * Enable if probing seems unreliable. Heaters and/or fans - consistent with the
+ * options selected below - will be disabled during probing so as to minimize
+ * potential EM interference by quieting/silencing the source of the 'noise' (the change
+ * in current flowing through the wires).  This is likely most useful to users of the
+ * BLTouch probe, but may also help those with inductive or other probe types.
+ */
+//#define PROBING_HEATERS_OFF       // Turn heaters off when probing
+//#define PROBING_FANS_OFF          // Turn fans off when probing
 
 // A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
 //#define SOLENOID_PROBE

Marlin/example_configurations/makibox/Configuration.h

@@ -586,14 +586,23 @@
 //#define Z_SERVO_ANGLES {70,0}  // Z Servo Deploy and Stow angles
 
 /**
- * The BLTouch probe is a Hall effect sensor that emulates a servo.
+ * The BLTouch probe uses a Hall effect sensor and emulates a servo.
  */
 //#define BLTOUCH
 #if ENABLED(BLTOUCH)
   //#define BLTOUCH_DELAY 375   // (ms) Enable and increase if needed
-  //#define BLTOUCH_HEATERS_OFF // Enable if the probe seems unreliable. Heaters will be disabled for each probe.
 #endif
 
+/**
+ * Enable if probing seems unreliable. Heaters and/or fans - consistent with the
+ * options selected below - will be disabled during probing so as to minimize
+ * potential EM interference by quieting/silencing the source of the 'noise' (the change
+ * in current flowing through the wires).  This is likely most useful to users of the
+ * BLTouch probe, but may also help those with inductive or other probe types.
+ */
+//#define PROBING_HEATERS_OFF       // Turn heaters off when probing
+//#define PROBING_FANS_OFF          // Turn fans off when probing
+
 // A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
 //#define SOLENOID_PROBE
 

Marlin/example_configurations/tvrrug/Round2/Configuration.h

@@ -579,14 +579,23 @@
 //#define Z_SERVO_ANGLES {70,0}  // Z Servo Deploy and Stow angles
 
 /**
- * The BLTouch probe is a Hall effect sensor that emulates a servo.
+ * The BLTouch probe uses a Hall effect sensor and emulates a servo.
  */
 //#define BLTOUCH
 #if ENABLED(BLTOUCH)
   //#define BLTOUCH_DELAY 375   // (ms) Enable and increase if needed
-  //#define BLTOUCH_HEATERS_OFF // Enable if the probe seems unreliable. Heaters will be disabled for each probe.
 #endif
 
+/**
+ * Enable if probing seems unreliable. Heaters and/or fans - consistent with the
+ * options selected below - will be disabled during probing so as to minimize
+ * potential EM interference by quieting/silencing the source of the 'noise' (the change
+ * in current flowing through the wires).  This is likely most useful to users of the
+ * BLTouch probe, but may also help those with inductive or other probe types.
+ */
+//#define PROBING_HEATERS_OFF       // Turn heaters off when probing
+//#define PROBING_FANS_OFF          // Turn fans off when probing
+
 // A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
 //#define SOLENOID_PROBE
 

Marlin/example_configurations/wt150/Configuration.h

@@ -588,14 +588,23 @@
 //#define Z_SERVO_ANGLES {70,0}  // Z Servo Deploy and Stow angles
 
 /**
- * The BLTouch probe is a Hall effect sensor that emulates a servo.
+ * The BLTouch probe uses a Hall effect sensor and emulates a servo.
  */
 //#define BLTOUCH
 #if ENABLED(BLTOUCH)
   //#define BLTOUCH_DELAY 375   // (ms) Enable and increase if needed
-  //#define BLTOUCH_HEATERS_OFF // Enable if the probe seems unreliable. Heaters will be disabled for each probe.
 #endif
 
+/**
+ * Enable if probing seems unreliable. Heaters and/or fans - consistent with the
+ * options selected below - will be disabled during probing so as to minimize
+ * potential EM interference by quieting/silencing the source of the 'noise' (the change
+ * in current flowing through the wires).  This is likely most useful to users of the
+ * BLTouch probe, but may also help those with inductive or other probe types.
+ */
+//#define PROBING_HEATERS_OFF       // Turn heaters off when probing
+//#define PROBING_FANS_OFF          // Turn fans off when probing
+
 // A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
 //#define SOLENOID_PROBE
 

Marlin/temperature.cpp

@@ -204,6 +204,14 @@ uint8_t Temperature::soft_pwm[HOTENDS];
   int Temperature::current_raw_filwidth = 0;  //Holds measured filament diameter - one extruder only
 #endif
 
+#if ENABLED(PROBING_HEATERS_OFF)
+  bool Temperature::paused;
+  int16_t Temperature::paused_hotend_temps[HOTENDS];
+  #if HAS_TEMP_BED
+    int16_t Temperature::paused_bed_temp;
+  #endif
+#endif
+
 #if HAS_PID_HEATING
 
   void Temperature::PID_autotune(float temp, int hotend, int ncycles, bool set_result/*=false*/) {
@@ -1194,6 +1202,14 @@ void Temperature::init() {
       #endif
     }
   #endif //BED_MAXTEMP
+
+  #if ENABLED(PROBING_HEATERS_OFF)
+    paused = false;
+    ZERO(paused_hotend_temps);
+    #if HAS_TEMP_BED
+      paused_bed_temp = 0;
+    #endif
+  #endif
 }
 
 #if WATCH_HOTENDS
@@ -1297,6 +1313,15 @@ void Temperature::disable_all_heaters() {
   HOTEND_LOOP() setTargetHotend(0, e);
   setTargetBed(0);
 
+  // Unpause and reset everything
+  #if ENABLED(PROBING_HEATERS_OFF)
+    paused = false;
+    ZERO(paused_hotend_temps);
+    #if HAS_TEMP_BED
+      paused_bed_temp = 0;
+    #endif
+  #endif
+
   // If all heaters go down then for sure our print job has stopped
   print_job_timer.stop();
 
@@ -1331,6 +1356,45 @@ void Temperature::disable_all_heaters() {
   #endif
 }
 
+#if ENABLED(PROBING_HEATERS_OFF)
+  void Temperature::pause(bool p) {
+    if (p && paused) { // If called out of order something is wrong
+      SERIAL_ERROR_START;
+      SERIAL_ERRORLNPGM("Heaters already paused!");
+      return;
+    }
+
+    if (!p && !paused) {
+      SERIAL_ERROR_START;
+      SERIAL_ERRORLNPGM("Heaters already unpaused!");
+      return;
+    }
+
+    if (p) {
+      HOTEND_LOOP() {
+        paused_hotend_temps[e] = degTargetHotend(e);
+        setTargetHotend(0, e);
+      }
+      #if HAS_TEMP_BED
+        paused_bed_temp = degTargetBed();
+        setTargetBed(0);
+      #endif
+    }
+    else {
+      HOTEND_LOOP() setTargetHotend(paused_hotend_temps[e], e);
+      #if HAS_TEMP_BED
+        setTargetBed(paused_bed_temp);
+      #endif
+    }
+
+    paused = p;
+  }
+
+  bool Temperature::ispaused() {
+    return paused;
+  }
+#endif
+
 #if ENABLED(HEATER_0_USES_MAX6675)
 
   #define MAX6675_HEAT_INTERVAL 250u

Marlin/temperature.h

@@ -259,6 +259,15 @@ class Temperature {
       static int current_raw_filwidth;  //Holds measured filament diameter - one extruder only
     #endif
 
+    #if ENABLED(PROBING_HEATERS_OFF)
+      static bool paused;
+      static int16_t paused_hotend_temps[HOTENDS];
+
+      #if HAS_TEMP_BED
+        static int16_t paused_bed_temp;
+      #endif
+    #endif
+
   public:
 
     /**
@@ -452,6 +461,11 @@ class Temperature {
 
     #endif // BABYSTEPPING
 
+    #if ENABLED(PROBING_HEATERS_OFF)
+      static void pause(bool p);
+      static bool ispaused();
+    #endif
+
   private:
 
     static void set_current_temp_raw();