The New York Times reports that the costs of three-dimensional printers are steadily declining, and that this decline could continue over the next two years. Three-dimensional printers have been used in industrial settings for about a decade, and typically are used to test parts designs for cars and other products before they are sent for manufacturing. Each machine once cost about $100,000, but now can be had for around $15,000, putting them within the reach of small offices and corner copier stores. These printers assemble objects out of an array of specks of material, similar to how traditional...

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