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Interestingly, the Sterling Silver is not actually 3D printed. Instead, they print your design in wax and then use it in the ancient lost-wax casting technique to mold the desired silver item. If you like they can even polish the item after casting to bring it to full silver luster for an extra USD$15 per item. Obviously, printing in sterling silver is more complex and time consuming than just a straight 3D plastic print – leading to their USD$48 per cubic cm materials price. But it’s Silver!
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Via Shapeways