Stack printer concept ditches the tray, eats columns of paper instead

Let's face it: even clever 2D printers aren't usually fun to watch. Mugi Yamamoto's Stack concept livens things up a bit, however. Instead of relying on a tray, the printer swallows paper from a column underneath -- like an animal that only eats company reports. The trayless design isn't just for novelty's sake, though. Stack is more portable than its conventional peers, and it's much less of a hassle to reload. Yamamoto has had a working Stack prototype for months, but he now tells Wired that h...