About this 3D model

Experimental design to substitute dual Z axis motor setup in cartesian 3D printers. Bearings are 605zz, threaded rods and nuts are M5. Use white teflon grease to lubricate. No backslash thanks to spiral gears. See it working here: https://youtu.be/-EybqXk5Lfg If you are a curious maker / "tinker" / hacker, have a look at my blog: www.therandomlab.com