Depending on what kind of motors, ball screw, and controller you use, it seems like it can range from $400 to $600. The setup I'm looking at would be closer to $600 because I'm opting for the stronger NEMA 34 motors. Probably not needed, but they're only about $40 more each. This estimate doesn't include software or a computer to run it on, both of which can be found for almost nothing.