Bowden extruder capacitive sensor mount

This is intended to be used with this e3d v6/lite6 mount: http://www.thingiverse.com/thing:1632847

I have changed the scad file from here: http://www.thingiverse.com/thing:1639085 to fit a 18mm capacitive sensor, and moved the sensor about 10mm further so it can be used with a circular fan duct (thing:2177911 to be precise). I've also made it more sturdy by increasing the size of the sensor mount & widening the shaft that supports it.

All credits go to mekatrol (who published an edited mou