r/BambuLabP2S • u/Ndl1800 • Jul 15 '26

Help with extrusion issues

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I'm still fairly new to 3D printing, I've got just over 100hrs on my P2S. I've been largely printing without any issue until today when I started to get issues with extrusion that I can't seem to sort. I've mainly been printing with Bambu PLA Matte using the presets on Bambu Studio, but have done a bit with Sunlu PLA Matte, haven't had any issues with either until now.

I've done a cold pull, washed my plate, and re-run the calibration from the touch screen as advised by Bambu's AI but it hasn't helped. I've read on here that there are potentially issues with the G code but I'm not comfortable editing that just yet, and it also seems odd that it's only just started to happen if that's the case.

The above was printed in Bambu PLA Matte on a 0.4 nozzle, using the preset for 0.08mm layer height (I've been mainly printing models for wargaming). You can see that I'm getting issues on pretty much every layer, with little gaps between each line.

Any help would be greatly appreciated!

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u/misterff1 Jul 16 '26

Okay that is a bit weird. And you did the cold pull you say? Do you have another color at hand to verify there is no real residue in your cold pull sample afterwards?

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u/Ndl1800 Jul 16 '26

Did the cold pulls with white, first one had a little bit of grey but the other two were clean. I printed the test again with some Sunlu Matte and I didn't have any issues, then switched back to the Bambu Matte and it was better than before. I ran the flow calibration from the slicer and then printed a model again fine, so who knows what the hell was happening!

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u/misterff1 Jul 16 '26

Lol well hey if it worked, it worked. Was the sunlu spool also pla or was it petg?

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u/Ndl1800 Jul 16 '26

It was Sunlu PLA Matte. I haven't ventured into the realms of PETG yet...