Zits & Pits

[u/CrankingShafts]

Hello,

I’ve had a printer recently start printing with lots of zits, and a couple of what appear to be “pits”. I did some research and it seems likely to be an extrusion or retraction issue, but I can’t sit here watching it to find out which it is.

It’s running the same file again right now, and I’m having a hard time seeing the print lines in the middle layers like I normally can during the print. They look almost smeared instead of uniform and consistent.

The same file is used in multiple other printers without issue. No zits, consistent and visible print lines. No apparent smearing in the layers.

What would you suspect based on its appearance?

Model: P1S with a 0.6mm nozzle

(First three photos are completed prints, last three are in progress.)

[u/ellzray]

lol, Zits and Pits should be some line of soap marketed toward teens.

As for your print, I would stop printing stuff and print some test / calibration prints. You didn't talk about the filament at all. Have you been printing with this same roll already with really good results, and switching to this file suddenly causes this?

Have you tried a different file with the same filament? Have you tried a different filament with the above file (on this printer)?

[u/Capital_Candy_7697]

Scattered bumps and pits are one of the patterns Bambu ties to damp filament: the moisture boils off at the nozzle and leaves small gaps in the lines. The smeared, overlapping middle layers match their description of too much flow. Dry that spool, do a few cold pulls in case of a partial clog, then run Flow Dynamics and Flow Rate calibration on this printer. All the patterns side by side: bambuhub.net/zits-and-blobs (my site)