HyperCube Redesigned E3D Fan Duct

This is a collection of some slightly redesigned fan ducts for the HyperCube 3D printer. Like many, I was having issues printing the fan duct. I tried using the fan duct from [arturslab's redesigned parts for Hypercube 3d printer](http://www.thingiverse.com/thing:2013475) that is slightly modified to be printed vertically & still had issues with printing the bridges at the top. These 3 versions make it a bit easier to print and more sturdy (the original is completely hollow). I have not tested t