This is the head of K2SO, the Imperial security droid from Rogue One. It's entirely 3D printed. Not as one piece, but about a dozen smaller pieces. I did not do the digital model but did do the finishing, assembly, paint, and electrical. I love how the paint and weathering turned out. He has a beat up, oily droid look, which for Star Wars is perfect. Why just the head? Well, because he's really cool. Also, the full droid would stand about 7 ft. tall.
Digital model on thingiverse.