Probe Z-stop driver fallback

  • Hi,

    I just witnessed my probe failing (i think...not exactly sure what happened there) and the nozzle crashing while Z-homing - this got me thinking...:

    Is it possible to use the TMC driver's feedback as a backup for a case such as this?


  • administrators

    That's not currently supported, however you could reduce motor current during homing using M913.

  • @dc42 Thank you for that amazingly quick answer - awesome support 👍

    I think this would be a really nice future security feature, I don't feel comfortable messing with adjusting motor current on the fly, but will keep that suggestion in mind - thanks a lot!


  • Moderator

    @duetwifiuser It's really not a problem to alter current on the fly. I use it all the time in my homing files. Here's an example:

    ; Home XY
    M913 X30 Y30	 		; set X Y motors to 30% of their normal current for homing
    G1 S1 X-375 Y305 F4000   	; course home X or Y
    G1 S1 X-375 F4000              	; course home X
    G1 S1 Y305 F4000              	; course home Y
    G1 X5 Y-5 F1000             	; move away from the endstops
    G1 S1 X-10 F600           	; fine home X
    G1 S1 Y10 F600               	; fine home Y
    M913 X85 Y85	 		; set X Y motors to 85% of their normal max current

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