A 3D-printed robotic hand controlled by pressurised water can complete the first level of classic computer game Super Mario Bros in less than 90 seconds.
Ryan Sochol and his team at the University of Maryland 3D-printed the hand in a single operation using a machine that can deposit hard plastic, a rubber-like polymer and a water-soluble “sacrificial” material. This last material enables complicated shapes to be supported during construction before it is rinsed away in water when the printing process is complete.
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