Planetary Gearset Retractable Keychain Model 2

A retractable keychain/badge holder with moving planetary gears.

This is a variation of my [other design](https://www.thingiverse.com/thing:3367924). Beside the look, the difference is that it is significantly smaller and lighter and assembly is much easier.

[full preview](https://gfycat.com/jampackedforcefulcod)

Other non-printed parts required:
- a clockwork spring ~3-4mm wide (might be taken out from a cheap mass-produced retractable keychan/badge holder)
- a nylon string ~1m length
- 6 m2x12 screws
- 4 m2.5x8 countersunk brass screws

upd: added STEP file containing the whole keychain assembly