Customized version of http://www.thingiverse.com/thing:84109

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=84109

Using the following options:

layer_height = 0.2
lithophane_border = 3
hole_diameter = 4
number_of_layers = 12
hole_border = 2
image_file = lithopaneatoz_4x620131215-1042-1p35vg1-0.dat