A pair of NEMA 17 stepper motors drive 4-mm pitch Acme threaded rods through toothed pulleys 3D printed from PETG.

What he came up with is a system built with hardware store parts. He’s using a plain old piece of threaded rod along with a coupling nut (they’re usually 3/4″ long or so).

Available in ¼-20, 3/8-16 and ½-13 thread sizes, Kindorf® Fast Set Beam Clamps are load rated at 250, 600 and 1,000 pounds respectively, exceeding the load ratings of the corresponding ...