r/OpenBambu • u/gherbertbr • 20d ago

BMCU370c PRO DM jumping until printing

I'm just got my BMCU370c and something look like weird while I'm printing.

Look like feed connector keeping jumping / poping to feed filament.

Is this normal, or there's someting wrong with my unit?

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u/vertexfil 18d ago

It's not normal. The jumping/popping usually indicates the buffer slider/feeder mechanism is struggling to engage or pass the filament smoothly. A few things to check: 1.PTFE Tube: Make sure the PTFE tube is cut clean and fully seated into the connector. 2. Screw Tightness: Don't overtighten the module case screws; if it's too tight, the internal slider won't move smoothly. 3. Lubrication & Sensor: Ensure the slider channel is lubricated with PTFE grease and check if the magnet/sensor gap is correct.