Several design firms specialize in doing amazing things with 3D printing and one of them is Belgium-based Unfold. Their new concept is streetside 3D printing. What? Yeah, it's exactly that - a street vendor that prints arbitrary stuff on demand. Not hot dogs, but objects.
Possible? Technically yes, but we suspect the clientele might get a little impatient while awaiting their Winged Unicorns as current 3D printers don't produce objects quite fast enough.