This is a working rangefinder which is remixed off of camuisc's file. It rotates and locks into position. The changes to the model is only the head and the rest is the same. The head has a 0.4mm slit which is perfect for fitting face shields into and a large area to place the face shield into. The larger slit works not as well but is easier to print. I originally made the boarder much thinner but I decided this would be better for added durability. The rangefinder allows you to find the distance of objects that are 6 feet tall and uses meters. However, you can adjust this your self when making the face shield insert. Please let me know in the comments if you need help with anything and how it works out for you.