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Awesome 3D printed rolling ball "roller coasters"

Erik Pettersson from Enkoping, Sweden made an inspiring gear painting on his eMaker Huxley 3D printer back in 2011. Last year he created a beautiful 3D-printed Kinetic sculptures. This year Erik Pettersson comes up with another 3D printed art-project: the ball sculpture. It reminds me the SpaceWarp, line …