About this 3D model

Note: I wound up making a third version that I'm using now. (http://www.thingiverse.com/thing:228536) ---- Improved version of my previous fan holder (http://www.thingiverse.com/thing:213416) : * Mount now has adjustment in 3 axes to accurately position the nozzle. * Exit nozzle surrounds hot end tip. * Nut detents in cowling. Holds a 60x60x10mm fan (I'll probably make a 40x40 adapter).