Filament Spool Adapter

thingiverse

This design slides over the filament spool holder on the Ender 3, purchased in 2019. It keeps the filament spool centered on the holder with less friction when the extruder demands plastic. With only the stock holder holding the spool, I found that it would tighten up a bit too much. Some serious torque was required to get it rotating, and that didn't sit right with me. I did not spend too much time measuring or planning this part. It fits my machine (Ender 3) perfectly, and it also fits most of my spools from various brands quite well.