Linear bearings run smoothly and are driven by a stepper motor. The screw has four threads, so it turns pretty fast. I use a NEMA 17 stepper motor to drive it and at 200 steps per revolution it moves the "table" that I attached by 1/25 millimeters with each step. The only thing that could be used in this set is a couple of cross bars that all the pieces could be attached to. You can also use eight more M4 x0.7 screws.
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