Customized version of http://www.thingiverse.com/thing:426709

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=426709

Using the following options:

_stroke_thickness = 1
_outside_width = 30
_corner_style = 0
_edge_cap_height = 0.0
_gaps = 0.3
_corregation_thickness = 5
_box_height = 30
_bottom_height = 0.0
_corregation_density = 0.866
_outside_length = 30