Filaments.ca Spools Adapter Inset Ring

This is a simple adapter for the Filaments.ca spool design. This inset is designed to be inserted into the back side of the spool where the hub hole diameter is bigger; it will even out both sides of the spool so it can fit all spool holders, including the Original Prusa MK2 printer spool holder which only holds the spool on the edges of the hub hole.