Duet 0.8.5 Valve control? (Open/Close while Extruding)



  • Hi

    Is there a way to get a signal to open and close a valve while extruding/retracting?
    I want to use this with a vacuum filler (for paste extrusion) which has an remote input. I already have a lvlshifter (3,3V to 24V), but i cant find a way to get an on/off signal of the duet board.



  • You might find this regarding GPIO (General Purpose Input/Output) helpful: https://duet3d.com/wiki/Using_servos_and_controlling_unused_I/O_pins

    You could use an Arduino on the vacuum side to 'collect' the trigger from the Duet and than do something else. This would give you complete control over how you want the vac to operate and for how long, once it was triggered from the Duet.


  • administrators

    Here are 2 ways:

    1. Set Output On Extrude, M571. This is suitable if you want to open the valve during extruding but not during retraction or on-printing moved.

    2. P parameter on G1 commands. This can control the valve however you want, but you need to generate GCode that includes the correct P parameters.


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