MPCNC Primo Z-Max Switch

I designed this thing to add a z-max switch to my MPCNC Primo. It is designed to work with the same size limit switches that are standard on MPCNC. It works with Burly style mounts, but may also work with others (the lever has to hit the top of the mount). It installs on top of your z-nut.

Is it necessary? Not really, but it's a valuable addition. Let me explain...

Most professional CNC machines can have an arbitrary workspace origin, aka WPOS zero can be anywhere (GRBL, Marlin, etc are the same). However, if you don't home your z axis, your MPOS may be set to zero wherever it was when you turned it on. If that is right next to your spoilboard, jogging down to your zmin will crash the bit. Adding z-max to your homing routine means your MPOS z=0 will always be at the top of your z travel. This is how most professional CNC machines usually operate for safety reasons.

Also if you want to do semi-automated tool changes with a fixed probe location, the machine must know it's absol