3D printer + moon rock -> lunar base

http://spaceref.com/moon-2/building-a-lunar-base-with-3d-printing.html

http://www.dezeen.com/2013/01/31/foster-partners-to-3d-print-buildings-on-the-moon/

http://news.wsu.edu/pages/publications.asp?Action=Detail&PublicationID=34094&TypeID=1

http://www.gizmag.com/3d-printed-lunar-base/26060/

Multiple units could be combined to form a multi-dome base (Image: Foster + Partners)

A 3D-printed structure, created using the simulated regolith (Photo: ESA)