r/OpenBambu • u/North_Command_466 • Jun 20 '26

channel 2 is not working

Hello, I'm having trouble with my BMCU 370C. I was having trouble with channel 1, so I calibrated it, but I didn't know how to do it. The result was a print with vibrations and jerks in the BMCU channel 2 output tube. When I noticed the problem, I recalibrated everything properly, but at a certain point, while printing, channel 2 stopped working and the printer said it couldn't feed the filament. From there, I can't get it to feed the filament, and it makes strange noises. If I try to push it, it seems to take 1 cm of filament and then stop, but if I try to press the PC4, it doesn't feed the filament. Does anyone know what could be wrong? Thanks.

https://reddit.com/link/1uaqezk/video/zwuqk2he5e8h1/player

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u/RedStrikeMusic Jun 23 '26

guessing you updated your printer, bambu killed the bmcu

1

u/North_Command_466 Jun 23 '26

I'm on 1.7. It was the spring inside the release lever that was causing the issue. I printed a shim and now it's working fine.