Planetary Gearset Retractable Keychain Model 2

A retractable keychain/badge holder with moving planetary gears.

This is a variation of my other design. Beside the look, the difference is that it is significantly smaller and lighter and assembly is much easier.

full preview

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