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Large foot print have layer shift  

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michael.i6
(@michael-i6)
Active Member
Large foot print have layer shift

Hi everyone,
I'm having trouble lately with layer shifting, mainly on the y axis. I have my printer Prusa mk3 for 5 months now and just recently I had a few prints with large footprint. I experienced a few times of layer shift and it's always the same symptoms, it happens after around 1cm height, and after doing bridging on top of holes. I checked the y belt tension and it's OK(280), it happened on silenced mode (crash detection off)
And also on normal mode. It's really frustrated since I have alot of design projects for college courses. I'm on slic3r 1.4.2 and the latest printer firmware.
I saw that I'm not the only one experiencing this issue, but I can't find a solution, just assumptions.
Any help would be appreciated.
Have a great day
Michael

Napsal : 12/02/2019 7:15 am
toaf
 toaf
(@toaf)
Noble Member
Re: Large foot print have layer shift

how are your shafts? I had to move mine around (chinese fire drill style) after like 3-4 months of non stop printing. see if they are still smooth.

I have a Prusa,therefore I research.

Napsal : 12/02/2019 7:33 am
michael.i6
(@michael-i6)
Active Member
Topic starter answered:
Re: Large foot print have layer shift

I'm not home at the moment but I'm pretty sure they are fine I cleaned them a few weeks ago. By the way I forgot to say that the layer shift is pretty big, around 1 cm of layer shift

Napsal : 12/02/2019 8:07 am
toaf
 toaf
(@toaf)
Noble Member
Re: Large foot print have layer shift

wow 1 cm.

might sound CrAzY but maybe rerun Z calibration. MAYBE...big maybe. but maybe you left and right Z are off abit.

I have a Prusa,therefore I research.

Napsal : 12/02/2019 9:08 am
toaf
 toaf
(@toaf)
Noble Member
Re: Large foot print have layer shift

picture with orientation would help greatly

I have a Prusa,therefore I research.

Napsal : 12/02/2019 9:19 am
michael.i6
(@michael-i6)
Active Member
Topic starter answered:
Re: Large foot print have layer shift

I did a z calibration a week ago because it happened, but then it happened again on a different print.
Searching for a picture

Napsal : 12/02/2019 10:02 am
toaf
 toaf
(@toaf)
Noble Member
Re: Large foot print have layer shift

just an idea. shifting 1 cm is BIG

I have a Prusa,therefore I research.

Napsal : 12/02/2019 10:05 am
michael.i6
(@michael-i6)
Active Member
Topic starter answered:
Re: Large foot print have layer shift

Can't find a picture of the object after the issue but this is the orientation

Napsal : 12/02/2019 10:10 am
toaf
 toaf
(@toaf)
Noble Member
Re: Large foot print have layer shift

100% gota see the print at this point. now I gota see it 😀

I have a Prusa,therefore I research.

Napsal : 12/02/2019 10:37 am
timo.m
(@timo-m)
Estimable Member
Re: Large foot print have layer shift

I have had layer shifts before on prints that cover around 80% of the build platform when printing PETG. Usually that happend when bridging over infill.
In my case it seemed like the part was trying to warp slightly, which resulted in a minor lift of the corners of the build sheet.

I helped myself by using binder clips to force the corners down. I also increased the infill slightly to help with the bridging.

Once (probably due to lifting corners) the nozzle even pushed the whole steel sheet a few millimeters away towards the front. The result looked very much like a regular layer shift as well.

Maybe you can check next time if your steel sheet lifts up in the corners or if it moves on the heated bed.

Napsal : 12/02/2019 3:19 pm
michael.i6
(@michael-i6)
Active Member
Topic starter answered:
Re: Large foot print have layer shift

I think you're spot on, it's really sounds like it's the problem. Yesterday on the a different print my whole bed sheet moved, and quite alot. Also the infill was 5%, so I think I'll try next time on a big print to use something to hold the bed sheet and also use abit higher infill.
What I'm figuring is that it's because the nozzle hit the print while plrinting so I wonder if higher z hop will help...?
Also I make my live z abit higher, maybe it will help.
Thanks for the help guys.
If you got more ideas feel free to share

Napsal : 12/02/2019 6:36 pm
Mustrum Ridcully
(@mustrum-ridcully-2)
Honorable Member
Re: Large foot print have layer shift

check that none of the magnets have been dislodged from the bottom of the heat-bed; if they have they are probably stuck to something else down then and you will need to epoxy them back in their slots.

Napsal : 12/02/2019 8:57 pm
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