Giant Nasa spider robots could 3D print lunar base using microwaves (Wired UK)

The product of joint research first started between space architects Tomas Rousek, Katarina Eriksson and Ondrej Doule and scientists from Nasa’s Jet Propulsion Laboratory (JPL), SinterHab is so-named because it involves sintering lunar dust — that is, heating it up to just below its melting point, where the fine nanoparticle powders fuse and become one solid block a bit like a piece of ceramic. To do this, the JPL engineers propose using microwaves no more powerful than those found in a kitchen unit, with tiny particles easily reaching between 1200 and 1500 degrees Celsius.

Nanoparticles of iron within lunar soil are heated at certain microwave frequencies, enabling efficient heating and binding of the dust to itself. Not having to fly binding agent from Earth along with a 3D printer is a major advantage over the ESA/Foster + Partners plan. The solar panels to power the microwaves would, like the moonbase itself, be based near or on the rim of Shackleton Crater in near-perpetual sunlight.

“Bubbles” of binded dust could be built by a huge six-legged robot (OK, so it’s not technically a spider) that can then be assembled into habitats large enough for astronauts to use as a base. This “Sinterator system” would use the JPL’s Athlete rover, a half-scale prototype of which has already been built and tested. It’s a human-controlled robotic space rover with wheels at the end of its 8.2m limbs and a detachable habitable capsule mounted at the top.