Hi...in my case the adjustment screw for tension is overly difficult to adjust, and from the factory set very tightly. On the flip side you can sortve see where the filament is going if youre having trouble loading it. It doesnt seem to feed 1.75mm as well as the original extruder does, after a couple attempts just to see (since I had files sliced already) i gave up and sliced again. The fan mount is a bit better placed so you can still see the nozzle and get to it to clean it easier. I was disappointed that for the price it did not come with a silicone sock already on it.