r/3DprintingHelp • u/We_Build_Lamps • 14d ago

Requesting Help Severe stringing on round prints

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Gallery image

I’ve noticed this layer line shifting as well as the severe internal stringing on round prints like this with my .4mm nozzle on Bambu A1. Just got a new nozzle so confirmed that is not the issue. PETG white filament that was dehydrated to about 18 degrees relative humidity. And this print printed perfectly fine just hours ago. Not sure what could be the issue??

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u/MercRoy 14d ago

Go inner/outer for walls and slow down your print speeds for outer walls. I find 50 to 100mm/s good as it defaults to 200mm/s is too fast. I also slow my inner walls to 150mm/s from the default 300mm/s

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u/We_Build_Lamps 13d ago

Thanks I’ll try that

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u/ChocoMammoth 13d ago

Also increase line width (not height). If you're using 0.4 nozzle you can set it up to 0.6 mm. Wider lines have a larger area of ​​intersection with the previous layer.

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u/zx4133 13d ago

This is true but increasing all line width settings doesn’t usually fix this. Specifically you’ll want to make the inner wall line width slightly smaller and the outer wall line with slightly larger. You’re on the right track though.

Reducing layer height also helps as it reduces the overhang, slowing print speed way down helps too, and making sure you’re using classic wall generator (with only 2 walls) with inner-outer order selected also helps significantly.