hotend fan on heater2

Author: inib

Marlin/Configuration_adv.h

@@ -346,15 +346,15 @@
  * Multiple extruders can be assigned to the same pin in which case
  * the fan will turn on when any selected extruder is above the threshold.
  */
-#define E0_AUTO_FAN_PIN -1
+#define E0_AUTO_FAN_PIN HOTEND_FAN_PIN // hotend fan on heater2
 #define E1_AUTO_FAN_PIN -1
 #define E2_AUTO_FAN_PIN -1
 #define E3_AUTO_FAN_PIN -1
 #define E4_AUTO_FAN_PIN -1
 #define E5_AUTO_FAN_PIN -1
 #define CHAMBER_AUTO_FAN_PIN -1
 
-#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
+#define EXTRUDER_AUTO_FAN_TEMPERATURE 50 // hotend fan will start at 50° C
 #define EXTRUDER_AUTO_FAN_SPEED 255   // 255 == full speed
 #define CHAMBER_AUTO_FAN_TEMPERATURE 30
 #define CHAMBER_AUTO_FAN_SPEED 255

Marlin/src/pins/stm32/pins_MKS_ROBIN_NANO.h

@@ -49,11 +49,11 @@
 #define X_STOP_PIN        PA15
 #define Y_STOP_PIN        PA12
 #define Z_MIN_PIN         PA11
-#define Z_MAX_PIN         PC4
+//#define Z_MAX_PIN         PC4
 
-#ifndef FIL_RUNOUT_PIN
-  #define FIL_RUNOUT_PIN   PA4   // MT_DET
-#endif
+//#ifndef FIL_RUNOUT_PIN
+  //#define FIL_RUNOUT_PIN   PA4   // MT_DET
+//#endif
 
 //
 // Steppers
@@ -96,6 +96,7 @@
 #define HEATER_BED_PIN     PA0   // HOT BED
 
 #define FAN_PIN            PB1   // FAN
+#define HOTEND_FAN_PIN       PB0 // Hotend fan on Heater2
 
 //
 // Thermocouples