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Tips for layer "gaps" on PETG?  

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Azonic3D
(@azonic3d-2)
Active Member
Tips for layer "gaps" on PETG?

I'm having issues with the first part of the layer not quite "sticking"to the layer beneath, which creates a hole/gap in the layer. If I switch from using an "aligned" seam to an "random" seam, this seems to resolve the gap, but leaves more of a bump instead, which doesn't look great in product photos. Anything I can do to get cleaner layer consistency?

Best Answer by Raaz:

I've found that the default filament settings of the Prusa Slicer don't really require a Seam-Gap.
Try to set it to 0 mm, instead of the default 0.15 mm or whatever the default is.
You can even try to use negative gap!

Postato : 02/08/2025 7:33 pm
Raaz
 Raaz
(@raaz-2)
Reputable Member
RE: Tips for layer "gaps" on PETG?

I've found that the default filament settings of the Prusa Slicer don't really require a Seam-Gap.
Try to set it to 0 mm, instead of the default 0.15 mm or whatever the default is.
You can even try to use negative gap!

Postato : 03/08/2025 6:48 pm
2 persone hanno apprezzato
Azonic3D
(@azonic3d-2)
Active Member
Topic starter answered:
RE: Tips for layer "gaps" on PETG?

I had no idea that setting existed; I will try that. Thanks!

Postato : 03/08/2025 8:04 pm
1 persone hanno apprezzato
Raaz
 Raaz
(@raaz-2)
Reputable Member
RE: Tips for layer "gaps" on PETG?

Normally, there's a blob at the seams, so stopping the extrusion a bit earlier helps a lot. That works nicely with my mk3s, which only has "linear advance". 

With the Core One, which has "Pressure Advance" + "Input Shaping", is a lot faster (especially the acceleration) and has a more advanced firmware & extruder in general: that blob isn't really happening.

So using the same gap settings can create a real gap now, instead of countering the build up at the seams. I switched the gap to the opposite value for some parts (not sure if the standard value is + or -..), to rather have a little built up, instead of the seam weakening the walls with a thinner spot.

Depends on the nozzle, temperature and the filament though. 

Postato : 05/08/2025 8:48 pm
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