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I once had the same problem. In my case is was the black feeding system @Carbon mentioned. In an eralier print some filament piece broke off and got stuck.
When the station tried to get the new filament in the feeding system the pressure got so big the two shells of the feeding system were pushed apart and the filament was curled up in the free areas in the station and did not reach the feeder.
Material Station chewing up filament
in UltiMaker 3D printers
Posted
I once had the same problem. In my case is was the black feeding system @Carbon mentioned. In an eralier print some filament piece broke off and got stuck.
When the station tried to get the new filament in the feeding system the pressure got so big the two shells of the feeding system were pushed apart and the filament was curled up in the free areas in the station and did not reach the feeder.