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 these yet. I'm merely in the early stages of building my HyperCube & printing off the parts on my existing printer.

Print these with a brim otherwise adhesion might be an issue.

The first version just introduces a bit of reinforcement in the middle of the duct. This makes the duct MUCH more sturdy but I still had some issues with the top of the print. All subsequent versions include this reinforcement

The second version makes the top angle about 1mm thicker. The duct is still ultimately