Weird layer shift on long prints
Hi
I got a weird layer shift when long printing. I read several topics on this with possible solutions like:
- Problem with transfers using Prusa Connect
- Belt tension
- Loos screews
I checked my hardware and everything seems fine and correctly fastened and tuned. The offset happens on X as well as on Y axis. What is also weird is that the offset happens at the same layer so I don't suspect the printer hardware to be the problem but the software (slicer and/or firmware).
So I went on and did some test print with different slicer settings. Basically I used the 0.2 structural system settings with Gyroid fill pattern. When I slice using the default pattern (Grid), the print will finish successful.
I was also able to record this on video. One hears a high pitch sound on Z layer move (at about second 5) and it seems the printer looses its Z position the next layer.
Printer: MK4s
Firmware: 6.2.0 / 6.2.1
Slicer: PrusaSlicer v2.9.0
Got anyone an idea, what's causing this problem? Thanks!
Best Answer by Mike B:
I was also able to record this on video. One hears a high pitch sound on Z layer move (at about second 5) and it seems the printer looses its Z position the next layer.
Printer: MK4s
Firmware: 6.2.0 / 6.2.1
Slicer: PrusaSlicer v2.9.0Got anyone an idea, what's causing this problem? Thanks!
I think you mean it loses its Y (and maybe X) position after the noise at 5s... not Z...
Switching to grid infill is the clue I think. Check the release notes for firmware 6.2.1 - there is a rare but repeatable issue with gyroid infill and certain shapes. With your thread pattern that might be the trigger (the initial post I saw was printing large gears).
It's possible (nobody has tried this to my knowledge) that if you change some of the gyroid parameters you might get it to print. But I would just change to another infill and get the print done. At least until the firmware issue is finally fixed...
See this thread: https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk4s-how-do-i-print-this/impossible-print-repeated-print-failures-arctos-robot-x-pulley/
Please show us the underside of a failed print.
Cheerio,
RE:
Sure. First layer looks ok to me and the prints sticks well to the plate (satin powder-coated).
Got another picture of another print. This one got an offset in both directions. Left one is the underside.
RE:
I was also able to record this on video. One hears a high pitch sound on Z layer move (at about second 5) and it seems the printer looses its Z position the next layer.
Printer: MK4s
Firmware: 6.2.0 / 6.2.1
Slicer: PrusaSlicer v2.9.0Got anyone an idea, what's causing this problem? Thanks!
I think you mean it loses its Y (and maybe X) position after the noise at 5s... not Z...
Switching to grid infill is the clue I think. Check the release notes for firmware 6.2.1 - there is a rare but repeatable issue with gyroid infill and certain shapes. With your thread pattern that might be the trigger (the initial post I saw was printing large gears).
It's possible (nobody has tried this to my knowledge) that if you change some of the gyroid parameters you might get it to print. But I would just change to another infill and get the print done. At least until the firmware issue is finally fixed...
See this thread: https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk4s-how-do-i-print-this/impossible-print-repeated-print-failures-arctos-robot-x-pulley/
Prusa MK4 since Jan 2024, Printables: @MikeB_1505898
RE: Weird layer shift on long prints
Thank you Mike. Overread this in the changelog. Thanks you for pointing out.
RE: Weird layer shift on long prints
I have been experiencing the exact same issue for the past two days while trying to print this: Silica Gel Dryer Spool. The instructions specify setting the top and bottom layers to 0 and using the infill as a vent. I am using 35% gyroid infill, and the issue occurs at random points with varying severity, producing the same noise as in your video.
I suppose we'll have to wait for a fix...