Penny Catapult
thingiverse
This is a penny catapult that might need some adjusting, but it should work.
Download Model from thingiverse
With this file you will be able to print Penny Catapult with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Penny Catapult.