Prusa I3 8MM X Axis Carriage Assembly

This replaces the poorly printed original. It uses set screws for smooth
rod assembly. The Idler has through holes that allow the smooth rods to be passed through so that you don't have to disassemble the entire X carriage to access the center mount. Extruder mounts 1/2" higher for added build height. Eliminates misalignment of feed and smooth rods. Designed for (8) standard 24mm linear bearings or (4) 45mm. Idler now has an X belt tensioner included. I've added a center section that has moun