This image might look a little grainy to you, but you really should give it a chance. What you're looking at is the output from the world's highest resolution colour printer, and it's actually an extreme close-up of an image that measures just 50 micrometers across — the same width as a human hair.
With tablets, smartphones and touch-capable operating systems, you could be forgiven for thinking that touch-based computing is only a new phenomenon. In product terms, though, it's been around for quite some time, as this 1983 touchscreen all-in-one demonstrates.
3D printers are typically behemoth-type machines that can spit out crazy things like houses, cars and titanium balls. The world's smallest 3D printer is too puny to do any of that but it could be more useful than any other 3D printer.