Remixed from the 60mm fan holder... This one I angled out and elongated a bit in order to get a wider "bite" on the RAMPS board and allow for some room underneath. Best if combined with some lifter-style legs for the Robo3D otherwise might not allow enough room with stock height. These are a good recommendation: http://www.thingiverse.com/thing:681876Good amount of infill (30%+) recommended for strength; will need to bend slightly...