Smaller spool holder for Velleman K8400. This should allow for spools with smaller diameter holes like Hatchbox's filament. This is still a work in progress but the spool holder should work fine. I plan to create a larger add-on that can easily be slipped onto this spool holder to allow larger spools to work easier without having to replace anything.

Print 2 and assemble just like the current spool holders but with M3 16mm bolts / screws instead of the 25mm ones. It should be able to line up with the current bearings.