Spool for Weed Wacker Filament (Low cost Nylon)

So i bought some cheap weed wacker filament made of Nylon and i needed a spool for the dry box
instead of using a regular filament spool i designed a hub with 2x 608zz bearing that will allow it to rotate freely when mounted horizontal

ButterflyNutM8 is a remix of https://www.thingiverse.com/thing:1692874/#files
it has a hole that is meant to be tapped M8