This slider uses an 500mm OpenBuilds C-beam and the design is such that the effective length of the slider is slightly less then twice the length of the C-Beam. It can be used both motorized or not.

3d printed V-Slot Gantry Plate leveler.

feel kind of bad calling this a build because of pretty much everything is off the shelf parts. I'm writing my own sketch right now for the motion but there is a version or 2 floating around on the net based of this design. I will post my code once it's done.