What can you do with a 3D printer? You can make your own paper airplane machine gun. That’s exactly what user Papierfliegerei demonstrates on YouTube. Most of the parts for this machine gun were printed by fabberhouse.de. A cordless screwdriver is used for driving. I don’t know about you, but I wouldn’t be able to get any work done if I had one of these. Even watching what this guy is doing is oddly satisfying.