Servo and spring operated light switch cover.
thingiverse
https://youtu.be/RkN8vXt9QCs This design is one of two variants of a servo-operated light switch cover to allow for the operation of an existing light switch by electronic means. While this design does not require a custom or 3D printed servo horn, it does utilize a 9mmx35mm compressive spring, though I'm sure a reasonable substitute can be made with or without some modification.
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