Reuleaux Triangle Keyring
thingiverse
Customisable keyring based on a Reuleaux triangle (https://en.wikipedia.org/wiki/Reuleaux_triangle), a shape of constant diameter. Multiple sets of keys can be attached to the different holes if desired. I will soon be uploading a version that allows for different Reuleaux polygons to be selected, please feel free to comment with suggestions and requests!
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