Wanhao i3 Backplate w/ 80mm fan

Update 2/28/2017:
User JIMBOTRON, http://www.thingiverse.com/Jimbotron, has thickened the screw hole walls making them easier to print and install. I have not tested his design, but feel this is a great addition and hence I added to the files here, as he suggested in his remix @ http://www.thingiverse.com/thing:2137022. Look for the file called JIMBOTRON_BackPlate_ScrewHole_Fix01.stl. If I get enough feedback that this version works, I'll deprecate the originals and mark this as the recommen