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- Originality: How original is this - never seen before?
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- Details: Express how much you like the details of the build.
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newer automated version
I've made an automated version of this perpetual calendar that uses motors, gears, and a Mindstorms NXT controller. Here's the video
I've also made a turntable video of the non-automated perpetual calendar:
Here is a PDF whitepaper describing the internal mechanism of this calendar