Spool adapter for Ender series printer spindle

This is an easy to print and effective spool adapter and spacer for Ender series printers so your filament spools are centered on the spindle and spin freely but with enough resistance that feeds and retractions don't unspool too much filament.

Confirmed to fit on Hatchbox and Overture spools that have an I.D. of ~55mm

Print two of the adapters and one spacer. 

Printed in PLA the spacers will flex around the spindle and fit into Overture filament spools.