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Can't turn on the heatsink cooling fan via the command line


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Posted (edited) · Can't turn on the heatsink cooling fan via the command line

Hi there,


I'm able to turn on the part cooling fan via

M106 P0 S255

When I try the same command with P indexes from 1 to 5, the heatsink cooling fan doesn't turn on. The fan is functional because it does turn on automatically when the hotend is heated.




Edited by bassamanator
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    Posted · Can't turn on the heatsink cooling fan via the command line

    The author configured the firmware that way.  There is no Gcode command for hot end fan speed.

    This is from the configuration.adv.h you linked.

    * Extruder cooling fans
      * Extruder auto fans automatically turn on when their extruders'
      * temperatures go above EXTRUDER_AUTO_FAN_TEMPERATURE.
      * Your board's pins file specifies the recommended pins. Override those here
      * or set to -1 to disable completely.
      * 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 FAN2_PIN
      #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_SPEED 255 // 255 == full speed
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    • 4 weeks later...
    Posted · Can't turn on the heatsink cooling fan via the command line
    On 5/13/2021 at 5:38 AM, tinkergnome said:

    It is (perhaps) still possible to set the pin state manually with gcode M42 - if you figure out the pin number that refers to "FAN2_PIN"




    So it still might be possible to do. Will look into it further. Thanks!

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