Follow3D Fully 3D printed follow focus and standard rail system

This was a little project that I am going to continue working on. I wanted to try out a follow focus on my camera but the price of them really isn't affordable for me, so I wondered if it would be possible to make a fully 3d printed rail system as well as the follow focus. Turns out it works pretty well, for light cameras it works best. I am unsure of what cameras will work on this but I know my Nikon D5500 works because that's what's pictured. The lens ring is for my 18-70mm lens with an outsid