This is the rocket that I used in my "Make your own Rocket Cannon" video. To see this rocket in action click the link below!

https://www.youtube.com/watch?v=7XIJSvsCpHQ

I used 16% fill when I printed this and it holds up nice and strong after every shot. But feel free to customize this and use your own print settings! This was my first time using Sketchup so the rocket may not look the nicest. I printed this in a MakerBot Replicator 2.