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3D printing and CNC milling each provide distinct advantages to those looking to rapidly prototype and iterate their designs. Rapid prototyping services like WayKen offer both, but it's important to know the differences between what the two technologies have to offer.
Researchers at ETH Zurich and Caltech developed a 3D printed submarine which doesn't need fuel, electricity, propellant or even an engine. Instead, it exploits temperature changes in the water to complete complex movements.