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Print shifting to the right or left mid way through printing  

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Rob Latour
(@rob-latour)
Eminent Member
Print shifting to the right or left mid way through printing

In my last 25 or so prints I've had three that have shifted to the right or left mid way through the print.

Attached is a photo showing two of the prints, on the print on the left the arrows show where the shift happens.

What could be causing this?

Postato : 28/05/2024 6:24 pm
Diem
 Diem
(@diem)
Illustrious Member

Look at your stats - LCD menu - are you getting crash reports?

Cheerio,

Postato : 28/05/2024 6:50 pm
Rob Latour
(@rob-latour)
Eminent Member
Topic starter answered:
RE: Print shifting to the right or left mid way through printing

my settings said crash detection was OFF; I turned it on, tightened some bolts, and am running another print now.

Postato : 28/05/2024 7:53 pm
Rob Latour
(@rob-latour)
Eminent Member
Topic starter answered:
RE: Print shifting to the right or left mid way through printing

Now I am getting several "Y Crash Detected" errors  - where the printer reset itself to the home position and then continues the print.  

Postato : 28/05/2024 8:33 pm
FoxRun3D
(@foxrun3d)
Famed Member
RE: Print shifting to the right or left mid way through printing

Common causes:

  • belt tension off
  • grub screws on motor shafts loose
  • nozzle hits infill (common with infills such as Grid) 
  • nozzle hits curling overhangs
  • Model warped and nozzle hits raised area

 

Formerly known on this forum as @fuchsr -- until all hell broke loose with the forum software...

Postato : 28/05/2024 10:17 pm
Diem
 Diem
(@diem)
Illustrious Member

... and possibly a jammed or failing 'Y' idler bearing.

Cheerio,

Postato : 28/05/2024 10:44 pm
Rob Latour
(@rob-latour)
Eminent Member
Topic starter answered:
RE: Print shifting to the right or left mid way through printing

It could be those things, but I found this post re frequent y axis crashes - and it seemed to apply to my case:

https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/y-axis-crashes/paged/4/#post-712213

Here is a note I posted to the thread just now: 

I'm having this problem too - using PTEG for a cylindrical model.   I tried a variety of the suggestions above, but none worked for me.  However, I then put my gcode thru this OctoPrint addon   https://plugins.octoprint.org/plugins/arc_welder/  and the issue seems to have gone away for the print I am printing now (however, the first layer looks rough).  In any case, in my case, I think it may be slicer related.  I am currently using PRUSA Slicer 2.7.4+ Windows.

Postato : 28/05/2024 11:02 pm
Rob Latour
(@rob-latour)
Eminent Member
Topic starter answered:
RE:

as an update, I am still getting crashes but far far fewer than before.

Postato : 29/05/2024 3:09 am
Diem
 Diem
(@diem)
Illustrious Member

Work through @fuchsr's list then, if the problem persists, show us the underside of a failed print.

Cheerio,

Postato : 29/05/2024 10:18 am
FoxRun3D
(@foxrun3d)
Famed Member
RE: Print shifting to the right or left mid way through printing

I am still getting crashes but far far fewer than before.

You should aim for better than that. The other thing is, I would disable crash detection, which I have done on all my printers. I find it to be too sensitive and produce too many "false alerts"

Formerly known on this forum as @fuchsr -- until all hell broke loose with the forum software...

Postato : 29/05/2024 2:35 pm
Rob Latour
(@rob-latour)
Eminent Member
Topic starter answered:
RE: Print shifting to the right or left mid way through printing

@fucher

You should aim for better than that.

I agree, I have since turned off crash protection and my prints are at least finishing.

However, I'm thinking more and more its the model, and as there seems to be one spot that the print was always crashing (over multiple prints) with crash detection was turned on.

 

 

Postato : 31/05/2024 12:35 am
Rob Latour
(@rob-latour)
Eminent Member
Topic starter answered:
RE: Print shifting to the right or left mid way through printing

Here by the way is the 3D model for the print:

https://www.printables.com/model/895165-brace-to-help-mount-solar-panels-against-a-fence

I have a MK3S, but if anyone prints this using PTEG on a MK4 I would be interested to know if they had any issues.

Postato : 31/05/2024 12:19 pm
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