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:

screw_diameter = 3.25
bracket_length = 12
bracket_height = 40
fan_hole_spacing = 71.5
pcb_width = 60.0
fan_size = 80
bracket_thickness = 3.0
cross_bracket = 5