Nikon DSLR Laser Focus Sight

This thing attaches this laser pointer 
https://www.amazon.com/gp/product/B09SZ3GFMC
to the eyepiece of a Nikon DSLR. Use it to focus in the dark or with microscope objectives. When you get the laser dot really small you have focus.  

https://youtu.be/lraxJEyZ4rk

Original idea was by Allen Walls https://www.youtube.com/@AllanWallsPhotography

Turn the laser off before taking your picture or it will change your exposure.

Project is parametric. The FreeCAD file has a spreadsheet and you can just enter measurements for other laser hardware. Please do not do powerful lasers as I wouldn't want you to damage any of the sensors in the camera. Low power is safe. Many lasers sold by amazon are not low power.