Oscillating Water Column Marine energy devices that can capture energy from water bodies take many shapes, as shown in these reference model illustrations. Image from Sandia National Laboratories Marine energy system developers therefore have a pressing need for more efficient and cost-effective prototyping techniques. To fill this innovation gap, researchers at the National Renewable Energy Laboratory (NREL) and Montana State University set out to explore the potential for rapid prototyping using additively manufactured composite molds. With $75,000 in funding from the U.S. Department of Energy Water Power Technologies Office's Water Power Laboratory Seedling Program, the researchers began a year-long effort to combine additive and composite manufacturing techniques into a faster, cheaper,