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what about some of the 3D printing materials? i’m not an expert, but if i recall there is one common material that 3d printers use that is basically just a corn starch derivative
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I also am not an expert, but my guess would be that it is also a plastic. Whether organic plastics have the same issues as synthetic plastics, I have no idea.
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No. Plastic is unbelievably cheap, so there's almost no way for a new material to come in cheaper.