Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4745244.
Picked up a DeWalt DW1450 Metric Tap and Die set at Home Depot. As it came in a blister pack, it needed a better place to rest. "Fingers" in the cover keep everything in place when closed, regardless of orientation.
I exchanged the stock taps for Rocaris gold spiral taps (Amazon). The stock taps fit.......but I designed it for the spirals.
2ea 8mm x 3mm neodymium magnets hold it closed.
1.5mm steel wire acts as a hinge.