This C02 rocket uses 12g cartridges to soar into the air! Unless you print with flexible filament or put a parachute on it, it's a bit of a 1 launch wonder! I'd suggest print one rocket per flight, as to make this an stronger only adds weight, but I'd be happy to see what others can do with it. I used a small rubber band to help hold the cartridge in the rocket though not necessary. You'll need to make a launch mechanism to fire it, I used a mousetrap to hit a nail and pierce the C02 canaster, and even used a rat trap and car locking remote system to allow remote launch! Video of the launch on the below link (very bad phone quality).

https://www.youtube.com/watch?v=DVyIloYcblM