Nerf blasters come in all shapes and sizes, but for a truly DIY feel, there's no better feeling than 3D-printing your own. That's exactly what "OutofDarts" did with his creation, called "Sylphrena", which is essentially a fully automatic Nerf Rival-style blaster that holds 65 rounds and features a simple flip top cap for reloading on the fly. It utilizes a brushless blower, flywheels and a pusher wheel to feed the balls. Click here to view the first image in today's viral picture gallery. Continue reading for a viral video of a Comic Con-exclusive Justice League movie sneak peak.