Polymaker Spool Adapter V2

This just fills the inside of the cardboard spool bore so it'll roll smoothly across a spool holder that goes through the middle. I use ASA, but almost any filament would be fine for this since it's a low stress part. The design is dimensioned to be made with a .6mm nozzle, .8-.9mm wide perimeters, and .28mm layer height. An internal brim is good but probably not necessary.