Pin to go in eSun cardboard spools to stop them turning in the ams. I found that some of my reels the outer edge was spinning and sliding around the cardboard spool. This pin solves that and is very quick and easy to print.

This can also be resized in the x y directions to make a plug for a cabinet hole where screws or dowels have been inserted but need to go all the way through the material

The eSun remixed spool is available here Esun Spool plastic Spool rim outer Remixed by tonyst - MakerWorld

Print with wide bit on bed no supports or brim needed for PLA