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This 1940s House-Building Machine Was the Original 3-D Printer

It supposedly could crank out a two-bedroom home in 24 hours.
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Modern Mechanix

Sure, 3-D printing has produced a five-story Chinese apartment building and is creating a bridge in Amsterdam. But one juggernaut of a machine was using similar tech to crank out entire houses seven decades ago, to believe a quirky item in Mechanix Illustrated.

A short story in the magazine’s June 1946 issue, dug up by weird-history collector Modern Mechanix, shows a huge contraption being conveyed by what looks like half a monster truck. Its operator would move it to the building site, then lower its mold over a pre-constructed house frame and start dumping in concrete. According to the article: