Gravity: There's Always a Catch

Technology Review has a piece on 3-D printing. It seems some people who try to use 3-D printing to make physical models of their fancy designs forget something.

"Sometimes, after an outlandish request—a character whose minuscule limbs simply won’t support a body, say—Carmy’s colleagues have to gently explain that different rules exist for physical product design. “We have gravity, for example,” she says."