Planetary Gearset Retractable Keychain
thingiverse
A clever device featuring an adjustable keychain with rotating planetary gears. [Image: A retractable keychain with moving planetary gears] Additional non-printable components needed: * A clockwork spring approximately 3mm wide, possibly obtained from a mass-produced retractable keychain such as the Lucky-Line 64001. * A nylon string about 1 meter in length. * Three m3x20 screws. * Five m3x8 screws. * Eight m3 nyloc nuts.
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