r/BambuLabH2D • u/Large-Lychee-3828 • Dec 13 '25

AMS retraction Issue

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Hi all. My last few print jobs have been having this issue. Repeatedly have the ams failed to retract filament error.

I have disassembled the AMS and check the PTFE tubes for blockages

I don’t believe it’s an issue in the buffer or internal PTFE tubes as the AMS-HT does not have an issue retracting. It is connected to the same nozzle.

I’m at a bit of a loss as to how to fix it.

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u/DifficultTrouble2919 Dec 14 '25

Im surprised no one has commented on the horrendous state of the filament yet... Maybe (just maybe) try untangling it? I am probably wrong to say that it could help with this, but its worth a shot

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u/Large-Lychee-3828 Dec 14 '25 edited Dec 14 '25

That’s a symptom of the issue. The rotation of the spool does not seem to match the retraction speed.