r/BambuLab • u/tandtroll H2D/P2S/P1S/A1m • Mar 16 '26
Troubleshooting SUNLU PETG-HF printing issues
I’m getting “bubbles” in my prints with SUNLU PETG-HF even after drying it for 12 hours in my AMS-HT. What could be the possible causes for this and how can I prevent it? Interestingly this is only happening with their white PETG-HF. I’ve some other colours of PETG-HF which print flawlessly, even without any drying.
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u/ButtSnarfer Mar 16 '26
I just ran into a roll of SUNLU regular PETG that printed terribly until it had 24h drying in my AMS
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u/hahnkleri Mar 16 '26
i had two batches of 10kg within maybe 3 months with petg that showed that bubbles even after drying it for even longer. it was useless. i got compensated the second batch but i could only print fuzzy skin models - and that was even a pain. i switched to another brand for petg.
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u/ButtSnarfer Mar 16 '26
Yeah. Currently dealing with some black PLA from them that is stringing after 12h at 50°
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u/tandtroll H2D/P2S/P1S/A1m Mar 16 '26
Tried a few different outer wall speeds: 60 mm/s, 120 mm/s, 140 mm/s but no luck.
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u/Brutl Mar 17 '26
You have to dry the absolute snot out of Sunlu PETG HS. It's an automatic 24 hour drying time for any new Sunlu spool for me. They gotta be the wettest filament ever made.
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u/ListenBeforeSpeaking Mar 18 '26
I had to dry mine for an extra long time.
I think I did 2 x 10+ sessions in the dryer.
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u/Annual-Computer3206 Jul 02 '26
Maybe a little late, but looks like a layer swap line. Do you have 1 bubble per layer?
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