Crossbow/slingshot (shoots up to 20 feet)

thingiverse

This is a mini crossbow/slingshot that can shoot 10-20 mm in diameter balls up to 20 feet. The only thing you will need after you print this is 2 rubber bands, or elastic. And you can use marbles, or pieces of paper crumpled up into a 10-20 mm diameter ball. 1. At the front of the crossbow/slingshot put a rubber band or elastic through the hole and tie around leaving some extra elastic left over, repeat to other side. 2. Tie the extra rubber band or elastic through a hole on the small piece with two holes in it, repeat with other side, and then tie the two rubber bands together behind it. 3. Pull the piece back so it looks like the first picture. Set a ball in, lift the piece up in the back and fire.