I was printing a part that was going just fine for 2+ hours, then the extruder clogged. I am using silver PLA and on further inspection, the extruder was just carving out an arc on the filament rather than grabbing it and pushing it through. I know the tightness of the extruder latch was fine because, as I said, it worked fine for quite a while.
My best guess is that as the build continued, heat ‘ran’ up the filament and expanded so that the extruder couldn’t retract it back through during traveling, which lead to the extruder carving out the filament, then not being able to grab onto it again to extrude.
Any other ideas as to why that would happen or how it can be fixed would be greatly appreciated!