MAKEzine Cannon-Cam Slip Ring

The MAKE magazine cover story about a 3D printed GoPro "Cannon Cam" (projectile that uses a "spud gun" to launch) lacked the slip ring STL in the provided archive. This works with the original measurements, and is printed at 80% fill for stability. Two of these are required for the projectile's completion. The full story and downloadable STL archive can be found at: http://makezine.com/projects/make-39/cannon-cam/