This is the motor-side gantry bracket from the http://Buildlog.net 2.0 Laser Cutter by Bart Dring http://www.thingiverse.com/bdring from http://store.makerslide.com/ .MakerSlide is an open source motion control hardware system based around aluminum extrusion with integrated V-rails. It makes designing light-duty CNC systems easier and more affordable. makerslide.com/Use this along with the MakerSlide V-rail extrusion model, found here http://www.thingiverse.com/thing:8992 , to design your own motion control systems in Sketchup, Blender, or OpenSCAD.Warning for OpenSCAD: placing other parts, like V wheels, close to certain overhanging areas of this model may crash OpenSCAD. You may need to forgo displaying one of the wheels that mounts to this plate to get a successful render.