This is a simple catapult that is made with only a few simple pieces that are easy to print. I envisioned this as being used for office feuds at work similarly to nerf office feuds. I made it as simple and reliable as I could.
For printing, you will need one of each primary piece, the aiming block, body, and launcher. This whole concept relies on the plastic flexing without breaking, so I recommend using a flexible plastic (I used PETG). The aiming block and launcher are connected via flexing the body, and there are 3 possible angles you can make using the aiming block.
I included 2 projectile types that you can also print if you would like. They both fit in the hole in the launcher for stability. The shorter one tends to fly in a slightly higher arc because it does not get caught in the hole as much, but as a consequence can fall out of the launcher more easily at the higher angles of the launcher.
No supports or raft are needed for this print.