Tolerance Test for press fit Box

A simple tolerance test for my [Arcade Button Box](https://www.thingiverse.com/thing:3145763). I want it to be press-fit, and for figuring out how far the walls need to be apart, I constructed this.
The bottom part is always the same, so you just need to print the top part, wich has the tolerance engraved.

Here are the [source files](https://cad.onshape.com/documents/fbb72adfc2ac9efca3d3c3e9/w/ac9656d8fc39326f02a92bb0/e/8f5abb3b4a34fb69a9185816), its made with OnShape CAD.


It might be h