Simple hub for your filament spool. Outer diameter is Ø60x10mm, inner is Ø8.3x14mm. As the arms are flexible, they 'snap' into the hole of the spool. Works great on the china-filament spools on the picture (hole is Ø55x10mm). There is no bearing, the hub rides directly on a M8 threaded rod / Ø8 smooth rod. Tested in ABS, but i think it may work O.K with PLA as well. Let me know if you try! I have a fairly parametric (non-SCAD) model. Let me know if you need another diameter and I'll upload another version :-)