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I would really like conductive filaments.
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Conductive metal filaments. This would be totally awesome, and I'd certainly like to print circuits, or circuits integrated in other pritns, on my FDM printer.
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Something stronger like aluminium
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Some extremely light filament. and chocolate of course.
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Filament that incorporates carbon fiber.
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I'd like to see more glow in the dark options. And, eventually, I'd like to see a 3d printer that could work with glass.
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improve or cheap metallic or some sort of alloy filament.
stronger PLA filament.
non toxic chemical or material to clean / polish PLA.
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Flexible conductive materials for printed in electronic circuits in soft materials like ninja flex.
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I'd like to see more varieties of flexible filaments.
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filament with the ability to cross-link between layer to improve strength and reduce anisotropy of prints