

Bambu Lab A1 – Intermittent extrusion issue, can anyone help?
Hi everyone, I’m having a strange extrusion problem with my Bambu Lab A1 and I can’t figure out what is causing it.
The problem is intermittent: sometimes the printer works perfectly, while other times it suddenly stops extruding during a print.
At first, I thought the issue was related to a specific black filament spool. However, I replaced it with a completely new spool and the problem happened again. For example, one print worked normally until around 43%, then it suddenly stopped extruding.
I’ve already tried several things:
Changed filament and spools
Cut off about 2 meters of filament and reloaded it
Tried different models and projects
Sometimes a model doesn’t extrude, then I change the model/filament, try again, and suddenly everything works
At Bambu Lab Support’s request, I printed a 3DBenchy, which completed successfully
I’ve already sent the printer logs to Bambu Lab Support
That’s the strange part: the printer can work perfectly and complete a Benchy without any issues, but then the extrusion problem randomly comes back on other prints.
At this point, I don’t know whether the problem could be a partially clogged nozzle, the extruder, the filament path, the AMS Lite, or possibly an electronic/sensor issue in the toolhead.
Has anyone experienced a similar intermittent extrusion issue with the A1?
What would you check or replace next?
Thanks a lot for any help or suggestions!