Testing of 3D Printed Rocket Engine V1

Small 3D printed Black Powder Rocket. Interesting project and not a lot of math. Just make it until it looked strong enough then went beyond it. I don't want to blow up my fingers so it was a small amount. Could do better on safety in regards to fire (Did have water hose and fire extinguisher along with a cup of water.) and handling of the rocket could be better. If you do decide to make this don't be dumb and if you are that's on you.