Parametric spool hub with M8 threaded hole

Parametric spool hub with three spokes and an M8 threaded center hole. Any M8*20mm bolt will fit into this hub and stick out just enough to go into the center of a 608 bearing. As shown in the last photo, these hubs can stay in both sides of a reusable spool while you refill it.STLs included:55mm: Bambu reusable spools, and newer SunLu ones.54mm: eSun, Jayo, DeepLee.63mm: older SunLu reusable spools.Make sure of your own spool dimensions before printing! Sometimes manufacturers change their sizing. You should be able to generate your own custom size hubs right here on Maker World, but failing that the .f3d file should cover you. Just alter the 'spool_ID' parameter and everything else is taken care of, including the de-bossed text label.I run some of my filament boxes on axles made from lengths of ground 8mm stainless shaft, but bolts are way cheaper and easier to get hold of. I've also found single axles awkward to work with: A single spool in a box doesn't need anywher