Planetary Gearset Retractable Keychain
thingiverse
A retractable keychain with moving planetary gears  Other non-printable parts are required: - a clockwork spring ~3mm wide (might be taken out from a cheap mass-produced retractable keychain like [this one](https://www.amazon.com/Lucky-Line-64001-Retractable-Chain/dp/B004C3YIP4?ref_=fsclp_pl_dp_3)) - a nylon string ~1m length - 3 m3x20 screws - 5 m3x8 screws - 8 m3 nyloc nuts
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