Customized version of http://www.thingiverse.com/thing:41524

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=41524

Using the following options:

OutterMessage = zerospeed8
ring_width = 7
font_spacing = 0
InnerMessage =
Font = write/Letters.dxf
font_size = 10
ring_size = 19.96
ring_thickness = 2.4