Tips to mitigate vertical artifacting Duet 2 Wifi
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Hey everyone, I am looking for tips to help mitigate vertical artifacting on my Duet 2 Wifi. I am using 1.8 degree LDO steppers in a core XY design and a E3D Hemera extruder. I can't seem to shake the vertical artifacts. I rule out power for the most part. I am running 24v, it's a 600w PSU and everything is grounded. I have tried different micro stepping and it does change the artifact, but doesn't get rid of it. Any suggestions are appreciated.
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Try varying the belt tension to see if has any effect.
Frederick
Printers: A FT-5 with the 713 upgrade bits, a custom MarkForged style, a small Utilmaker style, a small CoreXY from kit and a E3D MS/TC setup. Various hotends. Using Duets (2 and 3) running 3.4.6
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Belt teeth on smooth idlers, or even belt teeth on small diameter toothed idlers can be a factor. It also looks a bit like regular ringing. What are your other print parameters? Post your config.g and slicer settings.
What does it look like with a regular ringing test print?
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Try printing your outer perimeter at really low speeds.
That looks like cogging, which tends to be speed dependent.
Basically stepper motors have speeds where they are stable, and speeds where they are less stable (related to things like winding, size, voltage etc). When its in an unstable speed range it will 'jump' between full/half steps, rather than moving smoothly between the steps.
I have a printer that at 80-90 mm/s does it really badly. But if I print the outer perimeter at 20-30mm/s you would never know. And solid surfaces don't show it for some reason.
If you are having steppers manufactured they ask what speed you plan on running them so they can design a winding to minimize cogging at that speed.
The other thing that seems to help is using bigger motors and under-driving them.
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@Phaedrux I thought about crossing the belt's I might try that. Config and slicer profile attached. I will print a ringing test. slicer settiongs.gcode config.g
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@theruttmeister Great info, this is 15mm/s.
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That's looking a bit cleaner. Is that a faint diagonal I see or is that an artifact of the image?
A good way to test what @theruttmeister is talking about would be to reprint that object sliced at 100mm/s and then using the speed factor to change the speed by 10mm/s every 10 layers or so.
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@Phaedrux Yeah, it's 45 degree striping. I will try it faster.
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More pic of the stripes. Reminds me of old school A4988 candy strips.
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For the sake of completeness can you provide your config.g, the results of M122 and M98 P"config.g". Maybe some more details on the printer.
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@Phaedrux Sure, I posted config.g above, but I can do it again. config.g m122.txt 10/2/2020, 9:23:33 PM M98 P"config.g"
Warning: Heater 0 appears to be over-powered. If left on at full power, its temperature is predicted to reach 265CThe printer is an EXO cube, almost just like this one.
https://www.exoslide.com/exocube-printer -
@brotherchris said in Tips to mitigate vertical artifacting Duet 2 Wifi:
@Phaedrux I thought about crossing the belt's I might try that. Config and slicer profile attached. I will print a ringing test. slicer settiongs.gcode config.g
Sorry I missed those before.
Nothing stands out as obvious in the config.
Which leaves us with mechanics and the minutiae of stepper drivers.
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@Phaedrux said in Tips to mitigate vertical artifacting Duet 2 Wifi:
minutiae
Totally agree, I am pretty used to troubleshooting these types of things. I have seen this before, but never on a 2660 driver. This post was mainly to see if any other Duet users were seeing this. Great discussion by the way, enjoying it.
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You might find this interesting: https://duet3d.dozuki.com/Wiki/Tuning_Stepper_Motor_Drivers
Not sure how applicable or helpful it would be in this case though.
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@fcwilt Thanks for the reply,
Left is normal, right is super tight belts. -
@Phaedrux Ringing test.
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Might be able to reduce the ringing a bit with a drop of jerk from 1200 to 700.
Hard to say if that would be enough to fix the benchy artifacts.
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@brotherchris said in Tips to mitigate vertical artifacting Duet 2 Wifi:
@fcwilt Thanks for the reply,
Left is normal, right is super tight belts.I wish I could remember exactly what I did to fix the problem. It was awhile ago when I had a CoreXY of my own design.
Frederick
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i switched to 0.9 degrees stepper and 16 tooth pulleys.
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Latest print, the 0.9 degree steppers are my last resort. I think I have exhausted most of my other ideas. I will switch them out today and report back.
