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mystery lateral shift in prints  

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mchahn
(@mchahn)
Trusted Member
mystery lateral shift in prints

I'm having trouble with print shifts on my MK3S+.  I've tried three times to print the same gcode.  See the attached image.  The reason I call it a mystery is because it happens sometimes in X and sometimes in Y but always at the same Z height.  Also I printed a tower and there was no shift. 

I'd think it was something on a guide rail or belt at one position but the inconsistency in X and Y rules that out.  And I don't see how a problem with the Z screws could cause lateral shifts.  I'm trying to print it now at a different bed location but I doubt that will help.  Does anyone have any idea what could cause this?

 

Posted : 09/08/2022 11:28 pm
Snuffleupagus
(@snuffleupagus)
Estimable Member
RE: mystery lateral shift in prints

@mchahn

 

It would appear you have a loose screw, a Grub screw some call it. I call it an Allen screw, it's the one that tightens on the arbor of the stepper motor. check those first.

 

They are on the X  and Y axis.

This post was modified 2 years ago by Snuffleupagus
Posted : 10/08/2022 12:52 am
mchahn
(@mchahn)
Trusted Member
Topic starter answered:
RE: mystery lateral shift in prints

I don't see how that could explain the weird symptoms but thanks.  I'll definitely check them out.

P.S.  I call them set screws.

Posted : 10/08/2022 4:10 am
Diem
 Diem
(@diem)
Illustrious Member

See step 28 here:

https://help.prusa3d.com/guide/2-y-axis-assembly_165795#166517

Then the same for X.

Cheerio,

Posted : 10/08/2022 1:18 pm
Jimbo70
(@jimbo70)
Estimable Member
RE: mystery lateral shift in prints

Odd that it always happens at the same z level. Try regenerating the g code. Please let me know what the final solution was.

Posted : 10/08/2022 1:32 pm
mchahn
(@mchahn)
Trusted Member
Topic starter answered:
RE: mystery lateral shift in prints

The problem went away.  I tried moving it to a corner and it worked, but also two more prints since then back in the center also worked.

I guess I'll never know what it was.  I'm going to do a thorough maintenance anyway.

Posted : 11/08/2022 12:56 am
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