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PETG weird edge issue (lemmy.ml)

submitted 4 months ago by csm10495@sh.itjust.works to c/3dprinting@lemmy.ml

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Hey folks,

I was printing a frame with a fresh unopened roll of PETG. I haven't seen this type of thing before. I'm guessing it's because I tried a new (to me) cura setting to move the seam to the corner.

Besides this area, everything came out great.

Any tips on how to get PETG and corner seams to not do this? (Or is the issue unrelated?)

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[–] mcmxci@mimiclem.me 2 points 4 months ago (1 children)

I've been dealing with the same for a while with rapid petg. For me it came down to tuning retraction/untretraction distance/speed. PETG is more generally more viscous than something like PLA and retracting too far can cause large gaps like this.

This can also be caused by oozing from the nozzle. The filament that is meant to go down next drips/strings out of the nozzle so the hotend under extrudes until the pressure is back

I don't see mention of your print speed but if it's fast-ish (above 100mm/s) the pressure balance in the hotend becomes a significant factor

[–] csm10495@sh.itjust.works 1 points 4 months ago

Mine printed at 60mm/s. I need to try changing the retraction around a bit.

Do people re-calibrate this stuff for every print or per roll or per brand? I yearn for a day when I could just hit print and it goes.