Duet Scanning Probe and Independent Z Leveling

micaheli

Feel free to move this wherever it belongs, it wasn't super obvious to me.

I'm setting up a printer with independent z motors and want to level the bed based on the scanning probe results. I do not have a discreet toolhead mounted probe other than the scanning one.

How is this done? I'm not seeing it in my search results or the duet documentation. I'm hoping this works without having to G30 with the scanning probe (Ive heard some inconsistent results are to be expected).

Any help is appreciated. I'm still a week or two out from needing an answer, but figured I'd ask now.

Thanks,
Micah

dc42

@micaheli you may be able to use the scanning probe touch mode that will be included experimentally in the next 3.6 beta or RC release.

micaheli

@dc42 Sweet. Got a link to any information on that yet or do I have to go digging through git comments somewhere? Is it akin to the beacon-touch? Using the accelerometer?

dc42

@micaheli see https://docs.duet3d.com/User_manual/Tuning/scanning_z_probe_calibration#using-the-szp-in-touch-mode-to-set-z-height.

micaheli

@dc42 thanks a lot. I'm surprised the accelerometer wasn't used for this. But I'll definitely give this a try when I can.

gloomyandy

@micaheli said in Duet Scanning Probe and Independent Z Leveling:

@dc42 thanks a lot. I'm surprised the accelerometer wasn't used for this.

You may want to take a look at a discussion about this over on the Klipper discourse and Github:
https://klipper.discourse.group/t/proof-of-concept-using-accelerometer-as-probe/4854
https://github.com/Klipper3d/klipper/issues/3741

They sort of gave up on it. Just to be clear some of the problems associated with using an accelerometer are also issues with touch homing with the szp. But one of the plus points is that it looks like it is possible to use lower speeds (than those discussed in the above links) when tapping the bed. I've been running some tests on the current code (along with DC42) and it looks promising, but probably still needs a little more work and fine tuning.

Apsu created this issue in Klipper3d/klipper

closed [FR] Use accelerometer as Z probe #3741

T3P3Tony

@micaheli seemecnc tried an accelerometer version of a delta smart effector many years ago and it was not a good choice compared to other sensing mechanisms.