FT5 Part Cooling Fan Duct for Titan Aero, 713maker X carriage, volcano nozzle

6/10/17 : Added V2 for both fan duct and 50mm fan bracket. Complete assembly is shorter and stronger. Fan now sits comfortably below X axis belt. Also added countersink for the underside bolt.

Upgraded from e3d v6 so we needed a new fan. After a dozen or so iterations this seems to work reasonably well. Fan brackets are from onebaldman's design (https://www.thingiverse.com/thing:1738499).