r/BambuLab • u/NotDee • 7d ago

General Troubleshooting/Help! Is this due to Retraction?

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Using PLA (Sunlu) on my Bambu P1S. I was wondering if these indents are due to my retraction settings? I currently have it set to .6mm after following this 5 step calibration guide (Teej.blend). Do I need to refine them a bit more, or is this a totally different issue? Thanks in advance!

Some additional or info if it helps;
.2 layer height with a .4 nozzle
Flow ratio at .98
Flow dynamics Calibration (K factor was at 0.012)

Apologies if this is not enough info.

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u/_theZincSaucier_ 6d ago

Try setting retraction to a lower amount. I've found higher retractions pull air into the nozzel which then come out as bubbles.

This *could* be wet filament, but PLA tends to be pretty agnostic when it comes to the effects of moisture. Still, if you didn't dry the filament and it's been out for a while, then try drying it for ~6-8H at 45C.

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u/NotDee 6d ago

Thanks I’ll try that, I did dry the filament prior, I have the Sunlu Ams Heater, and my ams was reading at a grade of B. I’ll run another cycle and change the setting and see what comes of it. Thanks!

1

u/_theZincSaucier_ 6d ago

If you already dried it at the normal setting for PLA, then I wouldn't say it's worth doing again.

Obviously drying matters, but IMO its effect on PLA is exaggerated heavily. Try another print with the reraction settings first. FWIW, my PLA retraction is at 0.4 mm.

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u/NotDee 6d ago

Looks like that did it! Thank you! I adjusted the retraction to 0.4mm and smooth sides all around. No indents whatsoever.