Daniel Norée’s OpenRC 3D Printed Quadcopter is a Treat for Your Eyes http://3dprint.com/61174/openrc-quadcopter/
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byAMT: "a collection of Jewellery with ball joints. By using modern technology it is possible nowadays to make shapes that are impossible to make using old techniques. It is impossible to mould a ball joint in ceramics or plastics all in one go, without assembly needed."