Printbed filament spool adapter ring

Just uploaded the updated version with slightly thicker ribs, rounded corners, and easier fit in the center hole. I designed these rings to fit the cardboard spools for Printbed filament. I got tired of the cardboard dust and wobble that you get from spools with dented edges. The ring snaps into the center of the spool and has 3 teeth that dig in and prevent it from slipping. I have tested it on 8 spools so far without issue. No more errors because the spool slipped and couldn't retract.Printed in Printbed black PLA on textured PEI plate. Original model was drawn in Fusion 360