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 = 36
screw_diameter = 3.25
pcb_width = 60.0
fan_size = 0
bracket_thickness = 3.0
fan_hole_spacing = 48.2
bracket_length = 30
cross_bracket = 10