40mm Fan Bracket for Jonas Kuehling's RepRap X-carriage

This is a bracket to attach a 40mm fan to Jonas' Reinforced Prusa X Carriage with Slim LM8UU Holder ( http://www.thingiverse.com/thing:18657 ), which has a stub on either end to attach accessories.

I built my printer two weeks ago, and this is the first thing of my own design I printed on it. I probably made a stupid mistake... just let me know.

Technically, it's mostly parametric. If you plug in dimensions for a larger fan, it should all scale... but it won't fit between the axis rail