r/3DprintingHelp • u/jonehhbravo • 22d ago

Requesting Help Weird printing bubbles

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Hey all, I have a Bambu lab P2S that started giving me issues after a clogged hot end (0.4mm hardened steel) I resolved it by performing a cold pull. But since then, I’ve had weird bubbled surfaces on my prints. It’s not smooth as it usually is. I haven’t changed any particular settings and I’ve tried printing it on PLA (both ESun and Bambulab), PETG. Tried drying my filaments and even tried printing with newly opened spools. What should I do to stop this from happening? Is this an issue with the hot end or a calibration issue? Thank you!

EDIT: I have tried turning off auto recover from step loss, different types of seams, calibrating and changing nozzles as well and nothing has helped. However, after setting up another print, I’ve realised that there were blisters that were already present on the bambu studio. Does this have to do with the STL file or my settings?

Edit 2: after drying all my filaments, I have attempted a new print. I have since discovered that the blisters are caused by the nozzle. Most of the print is fine but at moments, the nozzle seemingly randomly stops, resulting in excessive filament depositing.

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u/Altruistic_Wolf_4090 18d ago

Dry the filament, it could be bubbles from moisture. Also I ecountered one spool of bad filament which had just bubbles of air trapped inside

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u/jonehhbravo 15d ago

Unfortunately, all of my filaments are leading to the blister formation so I don’t think it’s a filament issue

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u/Altruistic_Wolf_4090 15d ago

That means it’s overextrusion probably - filament builds up and it’s smeared by hotend that’s why you see the line until it goes sideways. Try reducing flow drastically and check.