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:

bracket_height = 50
cross_bracket = 10
bracket_thickness = 3.0
fan_hole_spacing = 32
pcb_width = 60.0
screw_diameter = 3.25
bracket_length = 13
fan_size = 40