Refillable Spool Core

This model is based on the cardboard core that ships with Bambu Lab filament refills.  A refillable spool core, it allows loading filament in either direction, the profile does call for a brim or it fails when printing PETG.  As pictured, it also has a small hole to allow respooling from the original spot on the cardboard cores as I have noticed when respooling as long as you don't crimp the filament at the hole it will feed through the AMS without issue, just lay it down and let the filament respool over it, it is usually spooled loosely enough not to crimp the filament.