Embodiments of the invention are directed to a method for printing a painted three-dimensional object. Each layer of the object is printed so that only the external circumference of the layer contains colored material. The building material used may be transparent, and a white colored material may be...http://www.google.de/patents/US7991498?utm_source=gb-gplus-sharePatent US7991498 - Method and system for building painted three-dimensional objects
