I am using the most recent firmware
When the filament ran out from the AMS slot that I was using. I was presented with an error saying that it could not retract the filament.
What used to happen is that when the filament ran out the extruder would use all that it could and then the AMS would request me to insert a new reel of filament.
Which was of course the correct thing to do.
But now as soon as it runs out it wants to retract it, which seems a little silly.
The only way that I could recover the print was to switch the machine off and on, which also seems silly.
My point is that it should not be trying to retract filament when it has run out.
I had something happen to me kind of like this.
I was using slot 3 and it ran out all the way to the hotend. Then I got the error to “cant retract filament”.
I was saying but why?
I could not figure out why it was doing this. Walked away for an hour or so. Went back and saw the light was out on slot 1. It had performed a filament check on slot 1 when the hotend ran out of filament. The filament in slot 1 broke off just past the feed tower in the AMS. Tore the AMS down and got the piece out and put everything back together.
Then everything started to work properly again.
Still lost the print tho.
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All the other AMS slots were Ok. In a previous version of the firmware, it used all the filament, then requested, correctly, for me to reload.
I’ll let it run out again and see if it does the same thing.
Oof am in this exact same boat. I was actually trying to use the auto filament run out feature but think the one that “ran out” ended up catching on something and throwing things out of whack. However it is doing exactly what you describe, odd feed in, then retract, then gets stuck and I have to turn off to reset. I tried checking all the easily accessible Bowden tubes on the back and in the AMS and cleared those out. I’ve read there may be an issue with the filament sensor by the hot end so I’m going to try taking that apart tomorrow to see if maybe that might fix the problem.
Weird thing is I was able to complete a PLA print relatively uneventfully, I would think if it was an extruded or filament sensor issue then the other AMS slots would have problems as well. Bah, had the X1C for a long while and this is the first hiccup I’ve run into. Forgot how tedious troubleshooting this sort of thing used to be -_-.
(My very first printer 3d printer experience involved installing a fan backwards which took me a few weekends to figure out 
)
