Seam-like artifacts around deretractions
 
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Seam-like artifacts around deretractions  

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tjhorner
(@tjhorner)
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Seam-like artifacts around deretractions

(I wasn't sure whether to post this in the CORE One or PrusaSlicer category, but since I can seemingly resolve this issue by using OrcaSlicer I have decided to post it here.)

When I slice a model using PrusaSlicer for my CORE One (with Prusament PLA Blend) using essentially default settings (tweaks to seam position, scarf joint, infill pattern, enable skirt) I am seeing seam-like artifacts around where deretractions happen. This is definitely not the actual seam as indicated by the g-code preview. The best way to demonstrate this is through example; you can see the deretractions here in the preview:

You can also see the seam indicated by the white line at the rear of the model. The finished part clearly has seam-like artifacts around these points of deretraction.

I ran a full suite of calibrations to rule out poor maintenance, but the problem remains. Would appreciate any guidance on this. I noticed the problematic deretractions are on the innermost perimeter so I'm increasing the number of perimeters to 3 to see if that mitigates it.

Here's the exact project file I am using for this test: moai-seam-test.3mf

Respondido : 17/03/2026 7:18 am
tjhorner
(@tjhorner)
Miembro
Topic starter answered:
RE: Seam-like artifacts around deretractions

Update: The problem is still present after trying with 3 perimeters instead of 2. Looking at the volumetric flow preview, I think it may be the scarf seams causing these artifacts instead. Disabling them to see if it makes a difference.

Respondido : 17/03/2026 4:16 pm
tjhorner
(@tjhorner)
Miembro
Topic starter answered:
RE: Seam-like artifacts around deretractions

Alright, disabling scarf seams fixed this specific issue. But I am also running into another very similar issue with a different model (similar enough that I'm not sure it warrants a new thread).

PrusaSlicer seems really intent on putting retractions/deretractions here around this corner of the model:

And when printed, I get these artifacts:

There are also retractions/deretractions on the back of the part:

When printed, they are not nearly as bad but still clearly visible:

I'm not really sure why PrusaSlicer is performing retraction here. It's also notable that these are distinct from where it says the seam should be.

I performed pressure advance calibration and that does not appear to be the issue.

Slicing the same model in the same orientation in OrcaSlicer with (ostensibly) the same preset does not produce the artifacts, because the retractions are at the seam instead.

Here is the file: transit-tracker-frame-test.3mf

Respondido : 17/03/2026 5:44 pm
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