Hello, finished assembling my MP3DP yesterday with a Ramps 1.4 board. I uploaded the Ramps 1.4 EFB firmware, connected the bed to D8, extruder fan to D9 and extruder heater to D10. When I turn on the fan manually with M106, the heatbed warms up slightly. When I turn the heatbed on with Pronterface, the extruder fan turns on. I Googled this and really can’t find anything that would explain this behaviour. I doubled checked the code in Marlin for pins_ramps.h, mostly this:
#define HEATER_0_PIN RAMPS_D10_PIN
#if ENABLED(IS_RAMPS_EFB) // Hotend, Fan, Bed
#define HEATER_BED_PIN RAMPS_D8_PIN
#elif ENABLED(IS_RAMPS_EEF) // Hotend, Hotend, Fan
#define HEATER_1_PIN RAMPS_D9_PIN
#elif ENABLED(IS_RAMPS_EEB) // Hotend, Hotend, Bed
#define HEATER_1_PIN RAMPS_D9_PIN
#define HEATER_BED_PIN RAMPS_D8_PIN
#elif ENABLED(IS_RAMPS_EFF) // Hotend, Fan, Fan
#define FAN1_PIN RAMPS_D8_PIN
#elif DISABLED(IS_RAMPS_SF) // Not Spindle, Fan (i.e., “EFBF” or “EFBE”)
#define HEATER_BED_PIN RAMPS_D8_PIN
#if HOTENDS == 1
#define FAN1_PIN MOSFET_D_PIN
#else
#define HEATER_1_PIN MOSFET_D_PIN
#endif
#endif
#ifndef FAN_PIN
#if ENABLED(IS_RAMPS_EFB) || ENABLED(IS_RAMPS_EFF) // Hotend, Fan, Bed or Hotend, Fan, Fan
#define FAN_PIN RAMPS_D9_PIN
#elif ENABLED(IS_RAMPS_EEF) || ENABLED(IS_RAMPS_SF) // Hotend, Hotend, Fan or Spindle, Fan
#define FAN_PIN RAMPS_D8_PIN
#elif ENABLED(IS_RAMPS_EEB) // Hotend, Hotend, Bed
#define FAN_PIN 4 // IO pin. Buffer needed
#else // Non-specific are “EFB” (i.e., “EFBF” or “EFBE”)
#define FAN_PIN RAMPS_D9_PIN
#endif
#endif
Would anyone have an idea of what the problem may be?