This single use rocket has a 10 degree twist in the fins. The extra fins are added for stability. Wall thickness is two passes with my extruder and the rocket body is very ridgid using PLA. The nose is flat because, when printing one rocket at a time, the tip gets melty. Designed for use with Estes model rocket engines size B and C. My tests have been with the B6-0 booster engines. I was inspired by some other single use rockets on this site. Then, I had to build my own with lots of parameters. SCAD and STL files are available. If your printer will print taller than mine, then feel free to increase the height. ( or any other parameter for that matter)I made this by printing it out. Cleaning up any strings left on it from the printing process. Loading it with an engine and launching it from a model rocket launch rod. Optionally, before you load the rocket engine, you can load the fuselage with sand or powder of your choosing. Be careful not to get any powder near the business end of the engine when loading. I had a couple mishaps over the 4th that were attributed to this.