Gyroscopic Rings Generator

This is a parametric version of the excellent Gyroscopic Keyring by
**gianfranco** found here: https://www.thingiverse.com/thing:1307100

Thanks gianfranco!

I wanted to be able to experiment with the number of rings, spacing between
rings, sizes, etc. so created this parametric version that allows the
customizer in OpenSCAD or the Thingiverse customizer to be used to alter the
model.

**Note** that you are encouraged to make your own customized version since I'm only providing one sim