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A series of polymer fins were designed and made using additive manufacturing techniques, to be tested by the Human Powered Submarine team at UCSD in a wet submarine that utilizes a thunniform method of propulsion. A 3D printer was also constructed in order to print these fins efficiently. Designs were inspired by the shape and semi-flexible properties of fish caudal fins. Materials utilized included polylactic acid (PLA), acrylonitrile butadiene styrene (ABS), polycarbonate (PC), PC-ABS blends,doi:10.5070/q23141215 fatcat:56vll2a4njbrjdmrmhjbkry2c4