Mendel90 Alternate Spool Holder v2 - Complete Overkill
Apparently there is no real standardization in spool sizes. This vexes me.
I redesigned the spool holder to be much thinner. This also required the male/female brackets to be flipped and the female one now prints holes down.
It can support spools with inside widths of 52mm to outside widths of 107mm.