We see a lot of CNC Machines here on Hackaday but not too ... Just like the X Axis stock hardware, all of the Z Axis parts were also ditched in favor of another eBay find, a 10mm ball screw ...
Computer numerical control (CNC) software is used to create tool paths for CNC machine control systems, or to turn a personal computer (PC) into a CNC controller. CNC uses computer-aided design (CAM) ...