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We recently spent a few very nice days at the sea. I knew there would be a beach with very neat sand, and so I prepared some toys for the kids. Before I go into details, I should mention that a short while ago I bought a 3D printer kit
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This is definitely one of the nerdier projects I have pursued. A multiplication machine made from paper, powered by marbles running through the machine. Here it is in action: You can build one yourself, if you are so inclined - you will find the template at the end of the