A music box powered by a 3D printed windmill [Source: Niklas Roy]
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![A music box powered by a 3D printed windmill [Source: Niklas Roy]](https://static1.squarespace.com/static/509c281de4b0cd18c7335aab/t/5b9beedab8a0457688fe611f/1536945884881/?format=1000w)
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