Looking like it would fit in perfectly in the smash hit game Portal, this little turret can launch a barrage of rubber bands on command. Designed by Kevin Thomas, this perky little gatling gun is mostly 3D printed, with an Arduino for a brain. You can download the 3D printed files on Thomas’ Thingiverse page if you’d like to assemble one of your own. The simple firing mechanism, essentially just a piece of string being unraveled from the barrel, allows this little sentry gun to fire its full 24 round capacity in a very short amount of time.

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