Torbjörn nerf sentry tower!
By CreativeSkull
Free
It's free to download
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Technical
Using 2 servomotors for rotation with some bearings. 2 smal servomotors for the trigger. 4 dc motors for pushing the nerfs, was already assembled. 1 laser pointer for the aim. bults and nuts. 1 arduino uno to control the board and 6 volt batteri for... yeah everything!
some spray cans and a lot of time and patience.
Free