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Conductive materials to be used with very high resolution printer, like SLA.
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HDPE would be nice especially if it could be extruded from recycled materials. I really wish I could print ceramic or would too.
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cheaper abs/pla materials; conductive filaments
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The conductive filaments are interesting to me and I would like to use them in the future.
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Biopolymers like polysaccharides (cellulose, starch, agar) or proteins (collagen, gluten, soy, corn).
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Organics. The ability to print out body parts to replace missing, damaged, diseased or weakened limbs or organs would be fantastic.
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Ceramic
Castible material for lost plastic casting
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multi-color - would make a simple print look finish with out painting. A camo anything would be cooler than a solid color thing.
edible - 3d print a mint
wax - 3d print candle
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Ceramic, again, answered earlier