Gilles Retsin of Softkill Design told Dezeen: "We actually don't even consider that a 3D-printed building because he is 3D-printing formwork and then pouring concrete into the form. So it's not that the actual building is 3D printed."

What also separates Softkill Design from the rest is the speed with which they claim they can get from start to finish. Their 3D printed building can be made in three weeks and put together in just a day. That's a pretty quick turnaround on a house, plastic or not. The single-story Protohouse 2.0 will be printed in a factory, moved in parts to the building site in vans and snapped into place.

Retsin adds: "You don't need any bolting, screwing, or welding on site. Imagine a Velcro or button-like connection. The pieces are extremely light, and they just kind of click together so you don't need any other material."