f humanity's longtime dream of a moon colony is ever going to be achieved, its architects will have to deal with the fundamental logistical problem of having to haul boatloads of building materials into outer space — an expensive and time-consuming endeavor that, quite simply, isn't feasible considering the financial troubles NASA is currently facing.

So... what then? The answer, say skyward-looking engineers, is to harvest available materials from the moon itself. The European Space Agency recently revealed plans to use a 3D printer to build the complex shapes and pieces of equipment that would make up an inhabitable space base.

3D printing, lest you forget, is a technique that allows users to "print" three-dimensional objects layer-by-layer. Usually, the printers employ plastic in place of ink, but a diverse range of materials like metal, clay, and yes, even chocolate can be used to print toys, furniture, or whatever else can be sketched out with AutoCAD, software for computer-assisted design and drafting. More recently, 3D printers have been the subject of intense scrutiny, with several media outlets reporting that people can theoretically build operational handguns and rifles at home if they download the correct plans.

Now, a team of researchers from the architecture firm Foster + Partners is exploring the possibility of using portable 3D printers to convert lunar material into a moon base. Working with a UK-based company called Monolite, researchers were able to chemically mold sand-like material together with a special kind of binding salt that forms into a sturdy, stone-hard solid. "Our current printer builds at a rate of around 2 m per hour," Monolite founder Enrico Dini tells Discovery News, "while our next-generation design should attain 3.5 m per hour, completing an entire building in a week." (Take a look at the base and the machine here.)

This, however, isn't the first time 3D printing has been tapped to possibly build a moon base. Last year, NASA challenged researchers at Washington State University to develop a technique to build smooth, cylindrical shapes for a future space habitat.