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:

ring_hole = 4.5
boarder_thick = 3
tag_size = 40
boarder_width = 3
image_file = keychain-customizable-lithopane-mark1-420170301-24784-bx8bry-0.dat
number_of_layers = 9
shape = 0
layer_height = 0.1