Servo for an extruder 'stepper'



  • Is it possible to use a servo to drive an extruder (Bondtech BMG, preferably) instead of a stepper with a duet? Anyone have any insight on where to look for a starting point if so?



  • Not that I can offer any help 😞 but just out of curiosity, why a servo?



  • Two possible answers, you pick:

    For science!

    -or-

    To compare to a Stepper!


  • administrators

    There is no facility in the standard firmware to drive a servo instead of a stepper motor. You could of course use an Arduino or similar to take a set of step/direction/enable signals from the expansion connector and convert them to suitable commands for a continuous-rotation servo.



  • @dc42 said in Servo for an extruder 'stepper':

    There is no facility in the standard firmware to drive a servo instead of a stepper motor. You could of course use an Arduino or similar to take a set of step/direction/enable signals from the expansion connector and convert them to suitable commands for a continuous-rotation servo.

    Thanks for confirming, David.



  • You could use a Adruino Nano and use the Fan from the Duet.
    Write a Sketch for Example aslong as the Fan is "on" turn the Servo I don't know 90° Degrees.
    After the Fan is Off turn it back.

    Should be not to hard to wirte. 😉


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