Cube Spinner: Two Versions (Loose or Grooved)

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Human: Cube Spinner: Two Versions (Loose or Grooved) If we make a circular cut around a vertex of a cube, adding some tolerance creates a spinner that has a strong aesthetic appeal. I gave my first experiment to a young student in my math class who said he loved it so much and wanted to keep it, and with the parent's approval, I happily handed it over. To prevent the core from falling out, we can add a groove. Based on my previous experience with spinning structures, I tried it out and was thrilled to discover that it makes an excellent math toy! There are two versions here (with two sizes), both of which can be printed in one piece at a resolution of 0.1mm. The loose version allows the core to come out so you can see its inner structure, making it easy to separate. The grooved version requires some patience - loosen the two pieces, clean up any rough edges as needed, and turn it around for a few minutes for smoother rotations. A drop of lubricant may also be helpful. Have fun!