I wanted to try to model and print an interrupted screw, and I went a little overboard and made three cannon models with interchangeable parts. They're not really based on any specific real-life cannons, just an image search and a little imagination. They fit together pretty well, I'm happy with them overall.
I layed the parts out as shown in the pictures and turned on support from bed only (although I think everything except the plug2 and plug3 would print fine without it). Printed on a Prusa i3 MK3
I printed with brown PLA filament, and tumbled the parts overnight with bronze nuts and bolts to get the metallic finish.
Hope you all have some fun with them.