Radial print cooling fans for a CoreXY printer

I recently built this CoreXY printer - http://www.thingiverse.com/thing:1003119 - and decided that I wanted to mount a pair of 50mm radial fans for print cooling, rather than the original single ducted fan (I had modified the X carriage and the original one wouldn't fit).

I aimed for simplicity as far as possible; the parts are exactly the same on each side, and use very little plastic.

Update: 12/02/2016
I found that these 2 fans are too efficient for the poor hot-end, to the point where