Hi there, Ive had my Ender 3 pro for about 2 years now and i don't know much about 3d printing. i just started using it again after not using it for months due to the power supply and me not being able to mess with it. im having some problems with it extruding. it starts up all good until the extruder extracts the filament a little to move to a different location. then it stops extruding. when i pulled the filament out the end of the filament was bigger in diameter than the actual filament size (1.75mm). any ideas of what it could be?