It seems to me that I've seen this same idea before...there is a film clip that I remember from the 1950s or early '60s lauding the advantages of automated fabrication of concrete housing. I even remember a large rig similar to that pictured here, using some sort of cast-in-place technology with heavy automation.

I wish that I could find a link to that old clip; it would be interesting to compare to this new technology to the old one.

In regards to it's use to provide housing following natural disasters (Haiti was mentioned), how will this structure, made of unreinforced concrete, withstand the next earthquake?

Larry

Why couldn't reinforcement be added as part of the "printing" process.  Automated concrete pipe plants draw wire to the correct gauge, automatically size and weld the reinforcement cages, place them in the "forms", place the concrete and move the finished product to the loading dock.  Rather than trying to scale up a miniature "3-d printer", it might be more helpful to go to an actual automated production plant to see how real concrete products are made; and then, figure out how to adapt a universal production controller to existing methods.  It would save a lot of reinventing the wheel, and, would result in a much better quality concrete product.