Anycubic Kobra 3 Spool Upgrade

This is a remix from a project by Gruenbaer for the Anycubic Mega-S spool holder. I considered this a must-have and I reckon it saved me a few prints. Figured I would adapt it for the Kobra 3 spool holder. Pretty straightforward but will need to use supports. Tidy up as required. A couple of R608 bearings finish it off. Dropped in the split filament holder if you don't trust printing in one piece.