My things was slightly inspired by the primitive tool: sling. You spin it up and somehow it shoots very quickly. Mine is a type where you spin while holding it like a thing that spins. Once its spinning fast enough, there will be a second rope that is attached to the locking pins.
This is the second version of it. The first one was terrible so I didn't post it. This one I have not finished printing yet and as its my second mechanical design, I dont know if the things are at a good size that they all fit together.
Once its finished and i make sure it works, ill make a video instructing how to build/use it. In the files there will be an image of what i imagine it to look like.
The author hasn't provided the model origin yet.