Due to the lack of success from out Model V8 Engine, we worked on other adjacent projects to motivate ourselves to continue through the long frustrating one. Nicole made a cool Rubber Band Shooter! It works by pulling a rubber band taught against the triangular notch and the rotating cross. With the nudge of a finger forward, the tension releases and the shooter fires the rubber band with a force that can go almost 10 feet forward.
Here are the CAD and 3D print of the shooter.
Above is a video of the shooter at work as well as an explanation of how it works.