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:

pcb_width = 84
screw_diameter = 3.25
bracket_thickness = 3.0
fan_hole_spacing = 71.5
bracket_length = 15
fan_size = 80
cross_bracket = 10
bracket_height = 30