Spool holder/adapter for variable spool diameters and 8mm threaded rod and 608z bearing

thingiverse

I redesigned this spool holder specifically for spools with an inner diameter of 56mm, so they can be easily adapted to fit snugly onto a standard 8mm threaded rod equipped with high-quality 608z bearings. The main reason I created this custom adapter is that universal spool holders often exert too much horizontal pressure on the bearings, causing them to spin poorly or even fail to rotate at all. In contrast, my design ensures smooth and stress-free rotation for optimal performance.