I did my MS thesis work on 3D printing at the single micron scale. There are some very cool applications for the technology, but I do not know what I would do with it outside of prototyping or using it to make molds for casting parts.

I'm a lot more bullish about technologies that print metal such as NASA Langely's EBF3 (http://www.nasa.gov/topics/technology/features/ebf3.html) than soft, anisotropic polymers.