Ender 3 Pro Spool Adaptor

thingiverse

UPDATE: Loosened up the tolerances a bit. It was too snug of a fit! So far, this works seamlessly with Hatchbox, 3D Solutech, and Dikale reels (I'll add more once I've tested various brands). The standard reel holders diameter is remarkably small, causing my reel of filament to bounce and jerk... this adapter eliminates that issue and enables a much smoother feed. Just slide it onto the spool first, then insert the spool with the adapter into the existing holder.