Catapult

thingiverse

The catapult is powered by rubber bands, making it easy to assemble. It can launch ping pong balls and marshmallows for added fun. Assembling this toy involves slotting axles through the base and adding wheels (use a rubber band if needed for better wheel attachment). Attach the arm to the base, place rubber bands from the arm to the base, add an adjustable arm, load your projectile, and then fire away!