Description This is a working cannon. It has a spring to shoot cannon balls. Use the hinge to aim precisely. Print as many cannon balls (included) as you need or shoot paper balls, peas, etc. In the base carriage, there are identations to store 2 cannon balls. (Better print two) Use it as a permanent display on your desk, ready to fidget or defend yourself whenever needed. Printing Print it without supports! Print it as-is, the cannon and front of the carriage should point down towards the print bed. There is a print-in-place hinge included to aim precisely. The spring (inside the cannon) is 3D printed, and works well also if you print in PLA. The design is fully print-in-place. No assembly required. Just remove from the print bed and fire away! The hinge and piston might need some initial movement to get going. https://www.thingiverse.com/thing:5421331