Impossible passthrough spinning top (FreeCad)
Description
This design was inspired by the Impossible [Pyramid Passthrough](https://www.printables.com/model/929314-impossible-pyramid-passthrough) and the question “can you make it spin?". The design is completely from scratch and in contrast to the pyramid, this uses two separate, subtly different shapes for the enclosing base and the top. At the moment, this is still a work in progress, but the answer to the original question is already “yes”. See it in action [here](https://youtu.be/JRhy11XL6ek?si=f4uisNWrI2LIbyR7).
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