Customized version of http://www.thingiverse.com/thing:166045

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=166045

Using the following options:

fan_size = 50
bracket_thickness = 3.5
fan_hole_spacing = 40
pcb_width = 60.0
cross_bracket = 10
screw_diameter = 3.45
bracket_length = 15
bracket_height = 36