Hello, community members I would like to share a recent experience that I had where filament (black XYZ) broke in multiple places and was stuck in multiple places. Here is a soultion and a fix. Do not try to remove the PTFE tube from the coupler the tension of the stuck filament will cause the PTFE tube to become stuck.
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Remove the outside PTFE tube first. Follow Bambu Labs guide on removing the filament buffer. Disconnect the cord and remove it entirly. Take the filament buffer piece and set it down.
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Now again do not try to remove the PTFE tube, it is stuck by tension. Find out which buffer is stuck and continuly keep pushing in a fast and rapid motion the orange buffer. After about 5 to 10 minutes of working it will become lose.
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Take a new peice of filament and push it through the buffer the filament should come back through the other side.
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Put the filament buffer back in, confirming it is not stuck. Load a new piece of filament and confirm it is extruding correctly.
This should solve any issue when filament is stuck inside the filament buffer. I replaced it fully and its working like its brand new. Please like and upvote this so this is one of the first soultions when people who have this problem are searching for a soultion.
This problem occured within 100 hours of printing. It seems as though it was brittle filament so no apparent printer issues. I have been printing fine ever since. If you have any questions please reach out.