Summary https://www.thingiverse.com/thing:2205891 really is the bestestest clip evah, but it did not fit on the Shaxon spool (rim of the spool is too thick). This remix has several sizes, with 0 through 3mm added to the width of the clip. I also added a small lip on the straight side of the clip. Update: http://www.thingiverse.com/thing:2243763 with size labels Print Settings Printer Brand: Prusa Printer: Prusa Mk2 Rafts: No Supports: No Resolution: 0.2mm Infill: 30% grid