Layer Fan Duct for Geeetech i3 pro C

I searched a lot of time for a layer-fan-duct for the
Geeetech's dual extruders printer (i3 pro C).
I haven't found any...

So... I decided to do something about it :)

I took the design of CyberMosfet (http://www.thingiverse.com/thing:577557) and changed it a bit to fit on Geeetech's printers.

> I did not print it yet

Before I will print it I want to consult the community, to ask what do you think, what and how we can improve this design.

Anyone who want to copy/change/tinker