Customized version of http://www.thingiverse.com/thing:308109

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=308109

Using the following options:

layer_height = 0.5
tag_size = 57
boarder_width = 1
number_of_layers = 13
boarder_thick = 2
image_file = keychain-customizable-lithopane-mark1-420140909-17204-1uft91r-0.dat
shape = 1
ring_hole = 4.5