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You can actually 3-D print with almost anything. All you need is a powder and something to bind it.
This means you can actually hack these at home 3-D printers to print with materials like fiber, salt and concrete (it has been done successfully with relative ease). It's a technology that's still in its infancy and actually has a lot of positive potential for more sustainable building practices that are very much plastic-free.
I think it's far too early to draw conclusions about how much more plastic waste it will produce when there is so much research surrounding 3-D printing technology being done at major institutions to solve these exact issues....
2 years, 8 months ago on 3-D Printing: Inspiring Creativity or Just Proliferating More Plastic Crap?