Sensing tool head offset



  • I'm working dual toolhead setup. T0 regular FDM extruder and T1 a syringe-based paste extruder. With any change, let's say a new needle, the needle will be off every time.

    Is there a way to measure and set the needle-offset by passing it through a series of different opto-endstops, let say X' Y' and Z'?

    This is with the intention of using a macro after homing T0 to set the T1 offset automatically.



  • Have you considered fitting a Precision Piezo sensor (https://www.precisionpiezo.co.uk)
    You just home the z axis each time you do a tool change, and with appropriate tweaking, should give you what you want.



  • Interesting those Precision Piezo sensors. However, the needle is too flimsy to make physical contact with any surface, it must be a contactless system.


  • administrators

    Use the G30 S-2 command. It will do a single probe and then set the Z offset of the current tool so that the stop height matches the configured trigger height.



  • Is there a way to probe the X and Y offset, similar to the G30 command for Z


  • administrators

    @docdiegoc said in Sensing tool head offset:

    Is there a way to probe the X and Y offset, similar to the G30 command for Z

    There is the M585 Probe Tool command. This command is likely to be extended in firmware 2.03.



  • I'll take a look.

    Thanks for the fast answers.

    I've been working with Marlin and Smoothieware, but the Duet it's a superior solution to anything I have seen. Congrats and keep up with the excellent work.


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