Customized version of http://www.thingiverse.com/thing:304177

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=304177

Using the following options:

render_size_reference = 0
line_width = .4
space_adjustment = .25
turns = 7
height = 20
width = 20
primary_color = blue
base_shape = 4
thickness = 4
side_length = 3