Printing a boat is something in this case, the boat itself was 3d printed in one piece using industrial robot based additive manufacturing, a technology that the researchers.
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3D Printed Propeller & Testing - XRobots from i2.wp.com
Three blade propellers for your boat models. You can also choose from. Both right hand and left hand propellers are provided.
The models are 3d printed in different materials, and usually come in three or four sets of prints that you can order directly from shapeways.