180x industrial lens focus mount

This is a holder for one of the "180x industrial microscope lens" that you see on AliExpress

It fits around the 50mm ring and takes three M3 bolts (I use 9mm length) to secure it so that you can rotate the zoom ring.

On one side there is a hole to take an M8 threaded rod, which you should probably tap rather than force in. If you look at the scad there's a rotate(30) which basically rotates the 3 holes around the ring, should you want to move them in relation to the M8 hole.

There's also a a T-piece (cube with two holes in!) to take a vertical rod and nut to move the camera+lens up/down to focus.