Bltouch oddity

BjornH

I have yet cleaned up all the files from M3D yet, as i have been strugling just to get this piece to work correctly. Bltouch to work optimal will be last piece

Phaedrux

I can't see anything in there that should cause the bltouch to stop, but it's a bit hard to follow.

For troubleshooting I would suggest generating a basic config using the web configurator and see if you can get it working with a basic config. If it works, then you know it was a config problem. If it still has the same problem then it's a BLtouch hardware problem. Either the probe itself or the wiring.

BjornH

Thank you for looking into it, i will clean up the files and try the configurator.

BjornH

Update to those who may have the same problem.

I can now confirm this is a wiring problem, as the dupont connection/wire is very bad.

After several tries and then squeezing the cable more onto the bltouch it suddenly worked fine again.

Veti

@BjornH
yes as i said earlier, the extension wire is causing a lot of headaches.

BjornH

@Veti I will swap out all, but i think the main problem is in the dupont connector itself, i will open it and tighten the connectors.

Veti

just swap to a different connector.

these are the ones i use for small wires

https://de.aliexpress.com/item/32856368582.html

TampaPrinter

I have a CR10 that does this too. Once in a while, like every 20 prints or so the bltouch simply checks out and goes on vacation for the initial home. Gives a message about already triggered but the Duet isn’t bothered by probe issues...it drives the Z into the bed until I stop it. Never fails during the 81 probe mesh, just the initial home. I’ve changed the BLTouch, swapped a new wire to the daughterboard then ditched it altogether and ran a new wire all the way to the Duet. Still does it with the same seldom frequency.

Though I have changed all of it, I get that it could still be a BLTouch issue or a wiring issue and have nothing to do with the Duet but the firmware should halt the Z when it knows the probe has failed. I find it odd that it doesn’t, though it is entirely possible I just haven’t found how to make it do so yet.

BjornH

@TampaPrinter I have not corrected my fault yet, since i have to dissasemble my extruder. I belive the problem lays in the pins (dupont) connection to the bltouch as they are not thight enough

3dML

@TampaPrinter

Though I have changed all of it, I get that it could still be a BLTouch issue or a wiring issue and have nothing to do with the Duet but the firmware should halt the Z when it knows the probe has failed. I find it odd that it doesn’t, though it is entirely possible I just haven’t found how to make it do so yet.

You can check for BLTouch sensor error before probing to detect some errors.

if sensors.probes[0].value[0]!=1000 ; if probe is not in error state
	M291 P"BLTouch ready to use" S1 T2
        G30