Simplest spool adapter

Yet another spool adapter, this time specifically for Raiscube 3D printer, but can be useful for other brands as well. The adapter has an ID=24mm and OD=57.5 / 56.8mm for the spools I have. Internal surface is a donuts-like half circle, so it touches the shaft at only one thin line. In fact, spool rotates freely, no more sudden moves, or stuck. The outer surface has a -0.5 deg taper, it is a press fit to the spool. Print & enjoy :)