Print heliLevel1.stl and heliLevel2.stl and slide them together. download your favorite level from the App store. the pitch gauge is a little loose on the iPhone 4 but I just shimmed with a piece of paper. Also I used a rubber band to make the slide hold the blade.

All the V2 files are the upgrades and replace the originals, this includes being able to use rubber bands to lock on the blade and the iPhone, this resolves the issue of needing shims, all else works the same. If you want to use the upgrades V2 parts just print the 3 V2a, V2b and V2c as they are full replacements. If you would prefer something simpler then the originals work when shimmed. The other two photos of the gauge not on the heli are of the V2 design. I hope someone finds these useful.