pico
thingiverse
u may print a 2D image by 3D printer as a portrait logo! in this way, the graylevel of image pixels maps to z-axis in 3D print proportionally. this method is suitable for BW images.
Download Model from thingiverse
With this file you will be able to print pico with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on pico.