So, while this isn’t exactly 3D printing, it’s close. Shapeways has an interview with Bjorn Hogberg, who is doing research on actually building things out of DNA. This reminds me of Neil Gershenfeld's TED Talk. The best quote from the talk:

The killer app of personal fabrication are products for a market of one person.

This is certainly a key insight. The beauty of this new wave in fabrication is the ability to make something exactly as you’d like it to be.

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3D Printing by steve