Improved Hexagon Cooling Fan Shroud for MakerFarm Prusa i3v and i3, sans fan hardware

A remix of clough42's Improved Hexagon Cooling Fan Shroud System for MakerFarm Prusa i3v and i3, I added two small crossbeams to the fan shroud to hold the fan in place without hardware. Only the fan shroud is here, you must also use the X axis shelf from http://www.thingiverse.com/thing:335613

UPDATE: I managed to upload a previous version with only one crossbeam, I've updated the STL file to the latest two crossbeam version on Nov 30th, 2014.