There was a gentlemen, Al, I think who had a Bambu Lab P1S extruder that was stuck.

I found this Youtube Video that shows the cause and how to fix it.

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Bambu Lab P1S filament clog. Wait till you see where it clogged! Watch this video to fix it FAST.
youtu.be

Mark

P.S. Sorry for the bandwidth, but I don’t have Al’s contact info and this might be of general interest anyways.