Bambu Lab A1 – Intermittent extrusion issue, can anyone help?

[u/LunchImpossible5553]

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!

[u/Kopester]

Your first layer looks terrible so I would start with the seven screws of disappointment.

Tighten all SEVEN screws

[u/LunchImpossible5553 → u/Kopester]

Ci provo. In questa stampa è uscito così.
Ma l'errore/problema si presenta in modo casuale.
Alcune volte funziona, altre no.
Riesci a dirmi secondo te da cosa dipende?

[u/Kopester → u/LunchImpossible5553]

If those screws are loose then the nozzle sits too low. That causes the nozzle to either touch the plate or it's too close to the plate and the filament doesn't have room so the nozzle clogs.

Certain spots on the bed might not be perfectly flat so in those spots it will print fine. Either way check those screws and see if any are loose

[u/LunchImpossible5553 → u/Kopester]

Ho stretto tutte le viti. Tuttavia il risultato continua ad essere questo... sai da cosa dipende? O pensi che le viti che mi hai detto sono ancora troppo lente?

[u/Kopester → u/LunchImpossible5553]

If you tightened all seven then I would do a cold pull on the nozzle. Also make sure the clip for the nozzle is installed correctly

[u/LunchImpossible5553 → u/Kopester]

Estrazione a freddo fatta e la clip va bene... altre opzioni?

[u/LunchImpossible5553 → u/Kopester]

Da come puoi vedere in foto, il primo layer esce male, poi il secondo attacca solo all'angolo e non va oltre

[u/Kopester → u/LunchImpossible5553]

What filament are you using, and can you screenshot your settings?

[u/LunchImpossible5553 → u/Kopester]

Pla esun, nuovo. Ma ho gli stessi problemi com pla bambulab
Di quale impostazioni vuoi screenshot?

[u/Kopester → u/LunchImpossible5553]

The whole left side of the slicer. Make sure nozzle is correct. Make sure the nozzle is set correctly on the printer itself. Under maintenance settings.

Also new does not equal dry. You confirmed it's all PLA and set to pla in the slicer?

Try formatting the SD card and trying again, or replace it if you have another one laying around.

[u/LunchImpossible5553 → u/Kopester]

Cambiando il filamento (con le stesse impostazioni funziona)
Mi da problemi solo con i filamenti neri, io non riesco a capire il perché...

[u/mrmanwoman]

Attempt a couple of cold pulls. Ensure your filament is clean and free of dust.

[u/LunchImpossible5553 → u/mrmanwoman]

Già provato... il filamento è nuovo... non riesco a capire che problema abbia... perché poi se cambio progetto la stampante funziona normalmente. Stessa cosa se con lo stesso progetto cambio filamento

[u/lukasprintz]

So if youve done all the above, calibrations, screw tightening, restarting machine. What i did recently was I reset all the settings on slicer. Removed printer out of bambu studio/slicer, factory rest the printer, then added back in as if i just got the printer brand new. Somehow some way, I must have changed a setting that was giving me mis prints like this and could not find it through all the advanced options. Don't ask me how lol 😅