Cardboard Spool Core Adapter v2 - Threaded

Reduce the friction between cardboard filament spools and plastic/metal holders by printing this adapter with the filament of your choice. Print both pieces to create a reusable, double-sides adapter, or just print the tall piece for a one-sided adapter that goes all the way through. *02/17/25 update: Added a slightly longer option for the threaded end cap. If you have trouble fitting the original onto cardboard spools, try this.