Bambu P1S Extruding extra after each 'Line'

Bambu Lab P1 Series Troubleshooting
1

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Hello, it seems my P1S printer keeps extruding a little bit extra after every printed ā€˜Lineā€™. By line I mean any continuous printed part. So a circle of an wall counts, or if a flat surface is being filled in then the very end of that printed surface (usually a corner) will have a little blob.

I donā€™t know what is causing this, but this is happening across all my different filaments. PLA, PLA-Wood, PETG, PETG-Transparent, ASA-Aero are all filaments I have noticed this with. It is more prominent with ASA-Aero because it is a foaming filament so it overfoams at the end and makes the material unprintable with. I didnā€™t even notice this issue until I used the ASA-Aero, as this issue doesnā€™t cause the other filament types to fail.

I have ensured that the filaments are dry. I have tested this with a 0.4mm nozzle, and even swapped to a brand new nozzle to test if it still happens.

aero3
aero31688Ɨ944 79.4 KB

This is with PETG. You can see the little dollops on each inner circle. (This Print overall succeeded)

aero2
aero21686Ɨ949 93.8 KB

This is with ASA-Aero, you can see the overextrusion with each long spaghetti section (the little dollop foams out into what you can see).

Does anyone know what can be causing this? Iā€™ve run calibration for both Flow Rate and Flow Dynamics and the issue is still happening.

1 Like
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Not a solution but I gave up on the light weight filaments because of this issue. I donā€™t have a link but in the forums here someone did a really good 3 part post on this type of filaments. He use pla but shoud apply to asa as well.

3

Have you taken a look into pressure advance and/or scarf seam. I think ā€œproblemā€ is the latter.

Anyhow, foamy filament (Aero type) is quite different than normal filament, so calibrated pressure advance value for normal filament may not work perfectly in this case. My gut tell me to turn up PA a bit, like from 0.04 to 0.06 for example.