I have a Prusa MK3s MMU2s which I was running a 7-hour print job on.
It had two spools of filament in, a blue one (primary, very little left) and a gold one (secondary, quite a lot left). It ran out of blue filament approximately 75% through the print job and rather than simply using the remainder of the blue and switching to the gold, the blue was bent and caught on the output nozzle of my spool container. It says that:
MMU needs user attention, fix issue then press button on MMU unit.
I have fixed the issue (snipped the bent part of the blue filament), however, I can't figure out how to make it continue printing. After fiddling a little bit, the red and green lights are all flashing, but no matter what MMU buttons I press, it doesn't continue printing. How should I fix this without cancelling the print job?