Quote Originally Posted by printbus View Post
If the alignment isn't good, perhaps the filament moves around, sometimes riding on the deepest part of the hobbed bolt cut and other times riding on the shoulder of the cut. It seems like that could cause some extrusion variability.
This can also cause the filament to twist as it comes off the roll. Or actually, it twists going into the extruder, but its connected to the filament coming off the roll and it can look like the filament is coming off a roll that was wound with twists in it.