Heli Flyer

Designed this in CAD software. I had something similar to this as a child. Hold the rod in the flat palm of your hands (and away from your face) and spin counter-clockwise. Let go and watch it fly. I printed this with 0% infill. It makes it much lighter.

Update: I put a new version 3 on here that I think is a better design. I made some design modifications and I adjusted the pitch a bit.