Spool Adapter for Shaxon/Ender3

Shaxon spools have very large diameter centers, creating large friction on the Ender 3's spool mount and causing filament feed to be unreliable. Use this to reduce friction and mount the spool a lot better.

Note: There are two spokes that extend very slightly beyond the diameter of the outer ring. I've noticed variance in spool inner diameter sizes, so this should allow you to squeeze the adapter into the spool snugly.