ROBO3D Leadscrew Upgrade Switch Mount

This is a modified version of this THING - http://www.thingiverse.com/thing:1147438

I found the original didn't work quite as well as I wanted it to. It kept rotating too much so I added wings on the side to minimise movement and also shifted the holes for the switch mounts ever so slightly. I also made the nut part at the top very slightly smaller as I found the original was too tight, although this could be down to calibration on my particular printer.