Probe Z-stop driver fallback

duetwifiuser

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?

Cheers

dc42

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

duetwifiuser

@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!

Cheers

Phaedrux

@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