Recently started getting Ziro filament shipped with cardboard spools, and couldn't find any spool adapters/rings that fit them right. I used the OpenSCAD files made available by @RobBobM to create the STL for rings to protect the AMS from cardboard dust, and to better spin in the holder

Print in any material, although if you will put the spool in a dryer with the rings in place, you want to use something to handle the temps - PETG for example

(imported from printables)