3.2b3: XY stalls when bed compensation activated

TypQxQ

I did run M122 while printing with bed compensation enabled and the "comp offset" is allways 0.000. Is that normal?

Phaedrux

It's common to experience this when a low Z jerk is set, to the point there is an entry for it in the mesh compensation documentation.

https://duet3d.dozuki.com/Wiki/Using_mesh_bed_compensation#Section_Troubleshooting

Try increasing your Z jerk. M566 Z100

TypQxQ

@Phaedrux tried even M566 Z500 and was no diffrence.
I reasoned that if it would be from xy moving to fast for z, then why would it be worse at a slower xy speed?

TypQxQ

Feels like I've tried everything now.
XY loses steps regardless what I do to the acc, jerk and speed.
Even raising the currents by 30%.

M203 X18000 Y18000	; Max speed 300mm/s

M203 Z24
M201 Z1000
M566 Z1000

M201 X500 Y500
M566 X300 Y300
G1 F12000

I've tried this too with my finger on emergency reset..:

M203 Z100
M201 Z1000
M566 Z1000

Phaedrux

Two things I would check.

First see if there is any other Z jerk M566 command in another macro that is getting called. homeall or the like.

You can also send M566 during the test to get a read back of the current value, just to double check it's not actually getting changed.

The other thing would be to copy your config and macro files over to a new SD card and get it setup for standalone operation without the SBC. If the problem goes away then we've narrowed it down to DSF.

https://duet3d.dozuki.com/Wiki/Getting_Started_With_Duet_3#Section_Running_in_standalone_mode

chrishamm

@Phaedrux There will be a fix for jerky movements in SBC mode in the next 3.2-b3+1 release. It won't take much longer before we release it.

@TypQxQ please check out this post.

TypQxQ

@chrishamm Upgraded to ” RepRapFirmware for Duet 3 MB6HC version 3.2-beta3+3-ch running on Duet 3 MB6HC v0.6 or 1.0 (SBC mode)” and looks like it fixed both the missed stepps and the stuttering.

Ran the macro above and runs well even at 500mm/s.

Doing a multitool testprint now.

TypQxQ

Thanky @chrishamm!
It works great now!!!

TypQxQ

@chrishamm Do you know if the new changes from ”3.2-beta3+3-ch” are included in the new ”3.2beta3.2” beta?
Didn’t see it in the changelog.

chrishamm

@TypQxQ Yes, those changes have been merged into the new beta as well.