This is a remix of a nicely working cannon by makkuro
https://www.printables.com/model/231584-working-cannon
The device is all print in place, with hinges, a spring, and a moving plunger.
All the stuff you see is under copyright. Proper credits go to mr_HU5KY
Category: Mechanical Toys
The author remixed this model. Imported from Thingiverse.
I've added some geometric fancy, smoothing the end of the cannon, and rounding all sharp corners. The slope of the side walls is also a bit more printer friendly.