I had to remix the original version to fit some of the spools that came with my ender 3 pro, which had a smaller hole, and are much longer. I've also extracted the "hook" that latches to the hanger itself so anyone can make their custom dimensions in any CAD, even TinkerCAD

Custom Dimensions: For what i can tell the original had a double 7mm square hole to save up on material, should not compromise the integrity of any rod