On Jan 3rd, we submitted this Ask Us Anything to Reddit:
We are two people who work in professional 3D printing. We will make the top 3 upvoted ideas real. AMA. The first, and most upvoted request, was a Desktop Catapult.
We got to work in our spare time, and have since then designed and printed 4 prototypes, each solving both the original request, as well as design problems we ran into in the process. You can see our video recap about how this process went in this video:
The Making of the Reddit Requested Desktop Catapult.
With that said, we are proud to present this fully assembled mechanical catapult comprised of multiple parts, but printed in one shot.
We are in the process of making some payloads for this beauty!
See video for demonstration :)