Customized version of http://www.thingiverse.com/thing:248635

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=248635

Using the following options:

jewlery_loop_thickness = 3
thickness = 6
backing = 1
jewlery_loop_position = 50
letter_spacing = 1
font_weight = 4
resolution = 64
third_letter = O
buildplate_selector = 0
second_letter = R
border = 4
radius = 14
first_letter = P