3-D printing now allows changes in colors. Image by Jonathan Juursema, Wikimedia Commons
New technique allows repeated change of color for 3D printed objects

The present 3-D printing technology does not allow the modification of a printed object once it is finished. Researchers from MIT now present a revolutionary technique that allows repeatedly changing the color of a 3-D printed object, after fabrication. They used a proprietary ink which changes color when exposed to ultraviolet light. This allows the change in color to occur in about 20 minutes. Currently the method is optimized for plastic objects but the team is working on expanding this to other types of materials such as clothing. 

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Scientific publication: http://groups.csail.mit.edu