via @IFTF: smallest 3D printer http://j.mp/3dp2kd. better: open source + self-replicating http://j.mp/3dp5hd ht: @asadotzler. World's smallest 3D printer www.innovationnewsdaily.com/worlds-smallest-3d-printer-1995/ costs $1700, but the open source and (mostly) self-replicating RepRap Mendel 3D printer costs only ~$520 in parts and they're developing it openly on a wiki: http://reprap.org/wiki/Mendel 
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