The first 3D-printed neighborhoood in the world

A giant 3D printer built two houses in an impoverished, rural part of Mexico last week, breaking ground on what will be the first 3D-printed neighborhood in the world.

The houses aren't just a prototype. Developers hope to build 50 new houses by the end of 2020, replacing the structures that residents built themselves out of wood, metal and whatever materials they could afford.