Print "repositioning" or "staggering" in the middle of the print
 
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Print "repositioning" or "staggering" in the middle of the print  

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frohgg
(@frohgg)
Member
Print "repositioning" or "staggering" in the middle of the print

I'm using a Prusa XL5, eSun PLA+ filament and Prusa Sli3er. And have had at least 40 successful prints.  The issue I describe below happens intermittently every 5-10 prints or so (different STLs).  Sometimes I can try slicing the same STL without the "input shaper" profile and it works, but in this case I've duplicated the issue with the input shaper printer profile AND the non-input shaper printer profile.

The pics below are using the 0.20mm DETAIL print settings and Original Prusa XL - 5T 0.6 nozzle printer profile.  I've also tried the Original Prusa XL - 5T Input Shaper 0.6 nozzle printer profile, and different combinations of print settings (e.g. 0.32mm QUALITY).  

As you can see in the pics it looks like midway through the print it just "repositions" the print up and to the left. Has anyone encountered this before?  What am I doing wrong?  

Thanks in advance!

Opublikowany : 23/01/2024 5:16 pm
ntdesign
(@ntdesign)
Reputable Member
RE: Print "repositioning" or "staggering" in the middle of the print

Some problem with fast moves maybe? You could try reslicing the print, but turn it 90° in plane and/or scale it down to check.
Could be one of the X/Y motors doesn't get enough current under load. Did you hear any skipping? What firmware version is this?

Opublikowany : 24/01/2024 10:34 am
frohgg
(@frohgg)
Member
Topic starter answered:
RE: Print "repositioning" or "staggering" in the middle of the print

I will try turning it 90 degrees and watch it and report back. 

I didn't hear any skipping but I wasn't next to it the entire time.  

Firmware version: 5.1.2+13478

Opublikowany : 24/01/2024 10:46 pm
frohgg
(@frohgg)
Member
Topic starter answered:
RE: Print "repositioning" or "staggering" in the middle of the print

 

Posted by: @ntdesign

Some problem with fast moves maybe? You could try reslicing the print, but turn it 90° in plane and/or scale it down to check.
Could be one of the X/Y motors doesn't get enough current under load. Did you hear any skipping? What firmware version is this?

@ntdesign you were spot on.  I repositioned it 90 degrees (same scale) and it printed fine.  How'd you know that would do it and would do I need to fix?  Thanks so much!!

Opublikowany : 28/01/2024 12:31 am
ntdesign
(@ntdesign)
Reputable Member
RE: Print "repositioning" or "staggering" in the middle of the print

Well, in corexy both motors need to move in tandem to create a straight line movement. If one of them lags behind the other sees increased torque until it results in a position offset. 
It's either a faulty motor or the wiring (check the connectors at the motors and mainboard, and the cables for kinks), or a mechanical component like loose motor pulley or belt tension (both easy to check). You can switch it off and move the head manually between all four corners, to feel around for any increased resistance. Try wobbling the motor pulleys around, the should be firmly stuck to the axles. Sometimes the grub screws loosen up or they weren't correctly torqued. But my money is really on the motor since it only occurs at high speed. Flipping it around helped, because it needs a certain movement distance to accelerate to full speed.

If you can't find anything obvious, I would contact support at this point.

Opublikowany : 31/01/2024 12:10 pm
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