Fully Printed Air Rockets

I have modified the original compressed air rocket created by Cbonsig to fit onto 3/4" PVC pipe. It was also modified to fit my Replicator 2 and add a center section allowing for additional rocket length.

https://youtu.be/N5xRYq3lPTw

I was inspired by the same Make Magazine article (http://makezine.com/projects/make-15/compressed-air-rocket/) but wanted to make an air cannon that was a little more versatile. I replicated the Air Piston Cannon created by NightHawkInLight https://youtu