We will use 3d printer outside the planet

Dave Evans : futurist
As we branch out as a species, it's quite reasonable to think that we'll send 3D printers to other planets to print habitats for humans prior to our arrival.

Popular mechanics, (2012) "110 Predictions For the Next 110 Years", [online], Available: http://www.popularmechanics.com/technology/engineering/news/110-predictions-for-the-next-110-years