In Minnesota, contractor Andrey Rudenko is currently working on a project of gargantuan proportions that seems to be stretching and exploring the limits of 3D printing technology. Using a printer that was substantially modified and expanded, he has printed a concrete castle in his own backyard. And at 3 by 5 meters, this concrete structure is the world's first 3D printed concrete castle, and one of the largest objects that has, up till now, ever printed with 3D printing technology.

Rather than trying to build a machine that caters to theme parks and history enthusiasts, this project grew out of a desire to construct a 3D printer capable of constructing durable, realistic and inhabitable houses. He's already looking at various locations to realize this: 'last winter in Minnesota, which was long and frigid, showed that it is crucial to have multiple areas in different countries for experimental printing since you can never predict which conditions will arise.'