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Holy layer shift!  

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khyzersoze
(@khyzersoze)
Eminent Member
Holy layer shift!

Finally got my first layer issues with PETG on Textured sheet worked out, but of course something else just had to go wrong....

Hopefully it's just a one-time thing.  Pulley and belts seemed to be fine, so I'm not sure exactly what happened.  Printing another print out right now and seems to be fine.

It just sucks that this was 7 hours into an 8 hour print.  I've had layer shifts before, and it usually looks like it would try to correct itself and go back to the right spot, but this one was weird, because it just kept printing normally in the shifted position.

Posted : 03/02/2022 6:03 am
Thomas
(@thomas-14)
Eminent Member
RE: Holy layer shift!

Your X-axis seems to have run into an obstruction causing the motor to skip steps and the calibration to go off. 
Can’t say from here what the cause could have been, of course, but when this happened to me in the past it was either the cable that was unable to move freely, or some dumb physical obstructions in the way of the moving printer head. 

Hope this helps

Posted : 03/02/2022 7:38 am
khyzersoze
(@khyzersoze)
Eminent Member
Topic starter answered:
RE: Holy layer shift!

I have a feeling that it's possible that some of the filament that gets stuck onto the side of the hot-end may have come off on one of the pieces and hardened at a higher height causing the x-axis to run into it on the next pass over the area.

Posted : 03/02/2022 8:28 am
Bob
 Bob
(@bob-2)
Reputable Member
RE: Holy layer shift!

 

Posted by: @khyzersoze

I have a feeling that it's possible that some of the filament that gets stuck onto the side of the hot-end may have come off on one of the pieces and hardened at a higher height causing the x-axis to run into it on the next pass over the area.

Seems unlikely, that would have to be some massive amount of filament to cause a shift like that, normally the heated nozzle would melt it's way through a small obstruction like a tiny blob or a single layer of filament.  If that little blob in the upper right of your pictures is suggestive of the blob of which you speak it wouldn't be enough.

Check your belt tension and grub screws on the servo motor gear.  I've also seen poor electrical connections do this, not on my Prusa but on my Ender 3, the cable to my X-Axis servo was poorly built and would sometimes cause the X-Axis servo to stutter, when it made connection again it would lose home and be shifted by a few millimeters. 

I will say one thing though, you've got some nice bridging 🙂

Cheers

-Bob

Prusa I3 Mk2 kit upgraded to Mk2.5s, Ender3 with many mods, Prusa Mini kit, Prusa I3 Mk3s+ kit

Posted : 03/02/2022 12:46 pm
Chicago Keri
(@chicago-keri)
Estimable Member
RE: Holy layer shift!

Possibly one of your parts lifted from the bed one one side, jammed the nozzle and caused the stepper to skip steps.  The more parts on a build plate, the more likely this is to happen.

Once a stepper motor is out of position, it will continue to print shifted as yours did.  The controller has no way of knowing that it is out of position without doing a home position check, which it does only at the start of a print.

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Posted : 04/02/2022 4:38 pm
khyzersoze
(@khyzersoze)
Eminent Member
Topic starter answered:
RE: Holy layer shift!

It's possible and most likely what happened.  Anyway, It's back to printing again, and seems to be working away just fine.

I may just play around with the orientation on the plate to see if I can get a faster print where the head doesn't need to move around as much.

Posted : 04/02/2022 7:06 pm
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