There have been other robots designed to 3D print buildings, but they’ve all had to be bigger than the final structure. These mini-bots- and their mobile supply trolley- aren’t restricted in the same way. They’re more likely to be building sturdier temporary structures at first. I could see rescue teams turning up at the site of a large disaster and using these sorts of robots to put a hospital up within a few days, for instance.

These Cute Little Drones Could 3-D Print a House | Design | WIRED.