Help diagnosing a bad print with multiple shifts and missing section of some layers
 
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Help diagnosing a bad print with multiple shifts and missing section of some layers  

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Sean Kane
(@sean-kane)
Eminent Member
Help diagnosing a bad print with multiple shifts and missing section of some layers

So, I have been printing with my MK4 and MMU3 for a few months now, and things have been going well overall. I have had the normal issues every once in a while that I need to troubleshoot, but this one is new and seems very strange to me. I had just finished a print using two colors  (black and red PETG) and started this single-color print (the same black PETG) that had almost a full plate of various items on it, including one large item.

I stopped the print a little while in, because it looked like this:

It is apparent that there was a layer shift for some reason, but the stringing between layers seems very strange. When I took this off the bed and looked at both sides, I think I saw where the initial issue might have occurred, and I have a suspicion about what caused the stringing.

FRONT:

BACK:

From the front on the light surface, you can pretty easily see through what should be a solid object. When I flip it over, it looks like the extruder lost its mind, which can be seen in more detail with this closeup of the bottom/back of the failed print.

Does anyone have any ideas of what might have caused this to go so haywire?

 

Thanks,

Sean

 

Posted : 14/08/2024 1:02 pm
Sean Kane
(@sean-kane)
Eminent Member
Topic starter answered:
RE: Help diagnosing a bad print with multiple shifts and missing section of some layers

I started a new print, and everything looks to be going just fine this time around, although it is only a few layers in.

Posted : 14/08/2024 1:35 pm
Sean Kane
(@sean-kane)
Eminent Member
Topic starter answered:
RE: Help diagnosing a bad print with multiple shifts and missing section of some layers

Scratch that. It started much better but still saw a more traditional layer shift after a few mm of layers. So, I guess it is time to check the belts tension, screws, etc.

Posted by: @sean-kane

I started a new print, and everything looks to be going just fine this time around, although it is only a few layers in.

 

Posted : 14/08/2024 6:04 pm
Sean Kane
(@sean-kane)
Eminent Member
Topic starter answered:
RE: Help diagnosing a bad print with multiple shifts and missing section of some layers

Ok. I am pretty sure that this was caused by my Y belt loosening quite a bit recently for some reason. I re-tensioned both belts (although X was basically fine) and reran all the tests just to be sure. A new print is running and it looks good so far. Fingers crossed that this fixed it.

Posted : 14/08/2024 8:55 pm
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