Mars colony basics + 3-D printing a Moon base

A look at some of the ideas discussed at the recent Human to Mars Summit on how to create sustainable Mars colonies: How to build a Mars colony that lasts – forever – New Scientist

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One technology that looks very important for making things, both small and large, in space colonies, wherever they might be, is 3-D printing: 3-D Printing Could Build Moon Base In-Situ – Aviation Week