I was sick of all the Z tube nut traps that were either off by a few mm's between the holes, or had nut spacing bigger than the M4 nut for a metric F model MPCNC.
So I designed my own which also includes a slide lid to secure the nuts from falling out when you try to mount them (rather than gluing them).
Tolerances are good enough that the lid will slid in/out with hand force, but will not fall out.
Tested with the F model tool mount from original design.
I sliced with simplify3D. you will most likely need support depending how you print it.
I printed it flat, and had support generated for the slide slot. It broke away with no issues.
Printed with Transparent PLA.