Mercedes-Benz have been using hemp particle board in their door panels for years.
Bamboo chassis:
Howard Hughes:
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FluidFM µ3Dprinter is the world’s first 3D printer capable of delivering sub-micron resolution in direct metal printing, while offering scalability and good prospects in both production cost and speed.
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Printing metal parts as a skin over an internal egg-crate reduces the materials, material cost, weight and the cost of shaping the material. They can print multi-materials, titanium and tool steel.