It is a simple matter to print an ebook or other document directly from your computer, whether that document is on your hard drive, at a Web site or in an email. But, imagine being able to ‘print’ solid objects, a piece of sports equipment, say, or a kitchen utensil, or even a prototype car design for wind tunnel tests. US researchers suggest such 3-D printer technology will soon enter the mainstream once a killer application emerges.
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