This project is an adapter for a cheap usb microscope, allowing to accurately focus the object.
It provides a vertical slider, holding the microscope, and a removable tray.
More details/pictures/though process can be found in the related blog post: http://www.revelut.ch/2016/12/16/building-a-microscope/
The project is fully designed in Fusion 360 and can be viewed/forked here : http://a360.co/2d3W5Ab (might help for assembly) and recombined into an svg
Cut everything out of 3mm mdf, cut chunk of an m6 threaded rod
Assemble the sliding part (small ring on the bottom, bigger hole on top), glue n M6 nut
Assemble the sliders into body
Insert the sliding carriage the put the threaded rod in place, add 2 nuts on top of the carriage
Finish glueing the body (top and back)
Use the 2 nuts to prevent the rod from getting out (hence forcing the carriage to slide down rather than the rod to go up)