Dual E3D V6 MK8 part fan mount

Part fan for Peter Stoneham's [Rigidbot Dual V6 Mk8 Alloy Mount](http://rigidtalk.com/wiki/index.php?title=Dual_V6_Mk8_Alloy_Mount_Kit_V2). Fits both version 1 & 2.
This fan mount takes advantage of the existing bearing bolts as well as the extra mount point on the far right edge (M3) to minimize sloping.

Consists of two parts in order to get perfectly flat bottom parts closest to the print bed, as well as to the carriage. The parts fit together with M3 bolts and nuts - or super glue if you