How to Build a 3-D Printed House in the Developing World

In the low-slung hills of El Salvador, building a house is not an easy task. The land is vulnerable to earthquakes, flooding, volcanic eruptions. The roads are rugged, electricity sparse. For the past several years, New Story—a housing charity based in San Francisco—has built over 150 homes there, replacing tarps and scrap metal shelters with …

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