Guy builds printer that can print concrete, the first thing he does? Prints a castle in his back yard.

A castle materializes out of thin air without hundreds of stone chiselers putting in decades of hard labor to make it happen. Is it the plot of a new Disney film? Nope. It's what happened recently in Minnesota -- and the wizard who whipped up this magic castle was Andrey Rudenko, a contractor with a background in engineering.

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