From human matter to food -- By Flow's 3D printer can produce edible substances. It's in an experimental stage right now, but can produce this 3D-printed caviar. Note that these aren't fish eggs, but fruit-flavoured edible globs.
Kings College Hospital is showing off this fascinating medical use for 3D printing. By scanning and printing (handled by precise printing company Stratasys), surgeons can get a look at what a patient's upcoming operation will involve -- a surgical practise run, of sorts. The red object in this photo represents a tumour, and knowing the precise size and shape of what they're looking for gives surgeons an edge during procedures.