Semi-Automatic Cannon/Slingshot

Semi-Auto Cannon | 13mm Shells

A rubber band powered, magazine feed cannon. That can shoot 5-6 meters (or 15-20 feet) with 2 rubber bands.
Its magazine allows you to fire continuous 3d printed bullets every time you pull back on the firing pin.

If you like this project, please consider supporting me by leaving a like, a comment, and a boost.

You can put as many rubber bands on this thing as you like, with the only tradeoffs being how hard it is to pull back and how much it might hurt if you have an accident. I personally prefer 2-3 as it is a good balance for firing power vs ease of use. 

The print functions by utilizing a ramming rod powered by 1-3 rubber bands to launch 3d printed bullets, when the rod is pulled back, it allows a 3d printed bullet from the magazine to fall down into the firing chamber, releasing the rod from here sends the fake bullet flying 6+ meters forward. This model was designed to be extremely simple and easy to print- only featuring just 2 parts moving parts that don't take much time to print. Jamming is rare but is extremely easy to fix thanks to how open the magazine is. 
 

The print profile has the main body positioned on its side, this is to ensure the magazine is strong enough to stay on top of the firing chamber. This also means you will need to remove some supports from the interior of the magazine. I recommend you deep clean it and remove any debris to help ensure the 3d printed bullets can easily slip through there without jamming. I enabled snug fit supports to make the print time quicker and to use less material. The whole mechanism took only 1.85 hours to print with the 6 3d printed bullets taking only an additional 50 minutes.  

I highly recommend you print some targets or use stacks of cups to shoot at, it makes the print far more enjoyable to use, and you can also test other models on your printed targets.

Ensure you are not using very old and used up rubber bands, doing so can result it in snapping unexpectedly. 

I do plan to release multiple versions in the future if this model does well!

I am not responsible for any misuse or modifications that could cause harm to anyone, do not aim at people, pets, or anything that is dangerous.