Customized version of http://www.thingiverse.com/thing:243650

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=243650

Using the following options:

tolerance = .5
box_maximum_length_or_width = 60
box_height = 20
build_plate_selector = 0
box_top_height = 15
box_shape = 1