I assume there's a clog but why is this happening?

0 points · submitted Dec 2025 by u/I-Code-Things · Discussion

I'm pretty new to 3D printing. I got a Bambu Lab P1S a couple of weeks ago.

I've had a couple good weeks of printing PLA and ABS. I ran out of the ABS, then attached the AMS 2 Pro unit and added some new BambuLab spools of PLA.

The first couple of prints went well but then all of the sudden an opengrid print missed the last few layers. I tried again and it only printed the first couple of layers.

Also, the AMS was throwing errors saying there was a tangle in the filament on the spool or broken filament in the tubes somewhere. I unrolled & rerolled enough filament to confirm there's no clog. I also took off the filament buffer and checked stuff, there was no break.

I searched the issue and it said the extruder could be clogged so I did some method where I heat up the hot end to 260 C, try to extrude (it did nothing), so then I reversed it and pulled the filament out and cut out the very slightly mangled end of it.

After putting everything back I tried another print. The first test strip was fine but I came back and it again only printed like one layer. The printer was going through the motions like it was actually doing something. It said the print succeeded but there was nothing to show for it.

I got a brass wire brush and brushed off some plastic that had built up on the nozzle. Some plastic was oozing out so I tried a Benchy. It started out well but when I came back it obviously failed again.

I'm not sure what to do. It seems like I am unclogging something enough for it to get some good layers down, but then it just clogs up again out of nowhere.

Printer Model: BambuLab P1S
Slicer used: Default Bambu one
Filament material and brand: BambuLab PLA
Nozzle and bed temperature: Default BambuLab for PLA
Print Speed: Default BambuLab
Retraction settings: Idk what this is but I haven't changed anything

2 comments · 50% upvoted · source · other discussions

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AutoModerator 1 points · Dec 2025

Hello /u/I-Code-Things,

As a reminder, most common print quality issues can be found in the Simplify3D picture guide. Make sure you select the most appropriate flair for your post.

Please remember to include the following details to help troubleshoot your problem.

Printer & Slicer
Filament Material and Brand
Nozzle and Bed Temperature
Print Speed
Nozzle Retraction Settings

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lordekeen 1 points · Dec 2025

Nozzle clogging is not that common, i would bet its the gear not pushing the filament or grinding on it, check all filament paths from spool to extruder, make sure there's no binding, and check if the spool can roll easily. If the gear cant push the filament correctly it wont print anything or will severely underextrude.

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