QUBD OneUp Offset Fan Bracket

I was helping out a friend who has a QUBD OneUp with some assembly issues so I started tinkering.

At one point I found I needed a fan bracket that would hold the stock fan, a duct and also provide a convenient place to mount the [Open Cable Chain](http://www.thingiverse.com/thing:611593). I also had started using the [Accessible/Viewable/Cleanable Extruder](http://www.thingiverse.com/thing:728158) which offsets the hotend from the NEMA motor. I was also intrigued by the [Fan duct on/off valv