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A gigantic 3D printer built this 12,000-square-foot mansion layer by layer

Remember that Chinese construction company that uses a giant 3D printer to make prefab homes out of concrete? Well it’s moved beyond the measly little 650-square-footers it started with and has recently produced a hulking, 12,000-square-foot mansion.

Despite being drastically bigger than previous homes, WinSun Decoration Design Engineering Co. constructed the house with the same equipment it has used in previous builds: a gigantic, room-sized 3D printer.

Measuring in at roughly 105 feet long, 33 feet wide, and 21 feet tall, this hulking 3D printer works almost exactly like a normal one — just on a much larger scale. It pumps a special type of pre-mixed concrete through a nozzle and onto a flat substrate. Layer by layer, it prints out a number of building blocks, which are then transported to the construction zone and pieced together to create the structure.

Check out the slideshow above to see what it’s like.