another reason for 3d printing by Xin Wei Sha Yet another reason for 3d printing, a math-poetic one: http://laughingsquid.com/a-3d-printed-sundial-that-displays-the-time-in-digital-format-without-the-use-of-electronics/ this joins the aerogel http://www.sciencealert.com/you-can-now-3d-print-one-of-the-world-s-lightest-materials-aerogel