Thingiverse's Tony Buser has an amazing approach to approximating the Hilbert curve, as Make's Sean Ragan explains:
Veteran Thingiverse user Tony Buser has printed a model (intended to be an approximation of the fractal Hilbert curve) using polyvinyl alcohol (PVA) as a support material. Once everything is printed and cooled, the PVA is dissolved away in a glass of water, leaving only the polylactic acid (PLA) model. This technique, when perfected, should allow RepRap-style FFF printers to produce objects with overhanging parts that are currently very difficult, or impossible, for them to print. Tony used two of MakerBot’s Mk7 extruders mounted on a Thing-o-Matic.
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.