Can cannon projectile

Untested "can cannon" projectile sized for a golf ball launcher (42.67mm), slides smoothly down a F5 Mfg tube. This could also be scaled up to a soda can diameter of roughly 66mm.

Two versions:
-spiral continuing inside, might have TOO much 'twist' when fired
-hollowed out inside, middle prints fine without supports however has some stringing. This is going to be fired and destroyed so I did not care enough to correct.

***Use at your own risk***

If you don't know what I am talking about: A "can cannon," "can launcher," etc is the dumbest device in the world. It attaches to an AR-15 lower to allow the user to shoot all sorts of things propelled by blank cartridges. Idiotic, wasteful....but fun.