This 3D modeling project will allow you to make and fly a Crayon Rocket. It was inspired by John Coker's webpage of his design, build, and flight of a box of crayon rockets.
http://www.jcrocket.com/crayons.shtml

You can see a flight video of them here.
https://www.youtube.com/watch?v=-dU...annel=JohnCoker

These nose cones, tail ends, and fin cans are designed to fit Estes BT-80 airframe tubes.

https://www.thingiverse.com/thing:4974346