XY step skipping

Sazabi

Hi, everyone
I have BLV cube with Duet 2 Wifi with rrf3.2, direct drive extruder, XY motors with radiators and coolers. Closed chamber(no wall near motors).
For some reasons on long prints I'm having steps skipping.
Motor current in config:
M906 X1600 Y1600 Z1600 E1600 I30
Print speed below 100.
Is my current too high?

jay_s_uk

@sazabi what stepper motors are you using?

Sazabi

@jay_s_uk Blurolls 17HM19-2004S, came with my blv kit.

jay_s_uk

@sazabi said in XY step skipping:

17HM19-2004S

1600ma appears spot on for those drivers.
are you cooling the duet 2 wifi at all? ideally, you should have air blowing across the back of the board behind the drivers

Sazabi

@jay_s_uk I have 5015 turbine blowing non-stop on radiators, glued on top of drivers

dc42

At 1600mA no cooling is needed, unless perhaps the Duet WiFi is in an airtight box or getting heated by other components.

Phaedrux

Is there anything in common with when it skips steps? Certain model feature causing curling perhaps?

Have you gone through the mechanical things that can lead to skips? Loose grub screws, binding?

Sazabi

@dc42 it doesnt have rear most wall, so duet isnt in closed box.

Sazabi

@phaedrux Actually, I dont know. I left it print overnight. Looking at where is skipped, it's about half time,~6hours. It was thin, but high model.
I had another long time print and skipping happened also. It actually looked like not just skipped step, but ~100mm momentary drift on X axis. it happened ~10hours after print start.
First time belts were tight, last time I've loosen them a bit.

Phaedrux

Maybe setup stall detection?

https://duet3d.dozuki.com/Wiki/Stall_detection_and_sensorless_homing

Sazabi

@phaedrux thanks, will try than