I finally got the nerve today to launch my first 3D printed scratch build. Just because of the weight I used an E16-8, and it was successful! She survived. If anyone feels like hearing my kids count down the launch, check out the video link:
Do you have a sim of it? This would help you know how it would fly with different motors.
I don't have much experience with 3D printed rockets except we had a small vendor at our launch one time and his rockets while being fairly large were very light.