filament stuck in tube
he problem, however, is not in retrieving the MMU, but the filament is not even pulled out of the head / engine.
The filament already seems to be stuck at the head because there is already a stuck on the end of filament through a plug / thickening, the filament gets stuck and therefore cannot be automatically withdrawn.
That is probably too stiff after which the withdrawal stops.
You can do it by hand afterwards, but then you have to put a lot of force. He seems to be hooking just before the small tube. Namely, if we pull the filament out by hand, the small tube will come out without too much play.