This is a single-spool design, but I wrote parametric source, so if someone needs a longer, wider, or thinner spindle, I will gladly generate additional models. v1.0 held the spool as I added features to and printed this version. v1.1 enjoys a better spindle end stop, chamfered spindle cuff offset, and a small rail on the mount's upper tab to improve leveling.v1.2 boasts a slightly longer spindle, improving spool compatibility (thanks to gbo for the suggestion!) I didn't cut away as much as I could, but since only one is needed, I opted for solidity.