1" 25.4mm spool collar

thingiverse

People use a 1" / 25.4mm ring to keep spools organized and apply gentle tension as needed. The ring is constructed from high-quality ABS material, oversized by 100% to 102%, which works flawlessly. To accommodate various screw types, simply drill out the holes with a matching bit. For instance, M3 fine machine screws thread in snugly without any need for tapping after reaming them with a 3/32"