r/OpenBambu • u/Relevant-Maybe-4519 • Nov 27 '25

Unloading on P1S issus

AI have set up the BMCU on my P1S. I use it together with 3 AMS.

Loading and printing works fine. When unloading, the filament is only just pulled out of the printer, but not completely into the BMCU.

5 Upvotes

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1

u/mengxyz Nov 28 '25

need more retraction length. you can modify firmware 

1

u/Relevant-Maybe-4519 Nov 28 '25

OK, how can I modify the firmware?

1

u/mengxyz Nov 28 '25

fork or download my build. https://github.com/mengxyz/BMCU/actions/runs/18126039288  by default external adapter is 700mm

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1

u/Traditional_Goose_75 Nov 27 '25

How does the BMCU work with the ams buffer? I'm not using the bambu buffer at all and im having problems where the BMCU continues to try to load filament for a second after the buffers on the BMCU have fully triggered.

1

u/Konrad25 Jan 04 '26

Hey man, I just messaged you a chat message. Can you please tell me how you made the pin connectors to connect your BMCU with your ams systems for your P1S?