- If your extrusion gear is stripping the filament down then you may some of these issues going on:

1) You may have some poor quality filament that is varying too much in size, circularity, or may even be over-sized (oversized will almost always cause a clog). Using some calipers make multiple measurements along the filament to make sure your filament diameter variable matches the filament your using. Take a look at my BLOG ARTICLE for more details on tuning this variable.

2) Another related possibility is that your extruder is trying to extrude more material than it can push out. This will cause back pressure to build up in the hot-end and will eventually make the filament stepper skip/strip the filament. The root of this is also directly related to the filament diameter variable. If you have a the value for the filament parameter set lower than what the actual filament diameter is then the extruder will try pushing more material than needed.