Mathematician Karl Reinhardt discovered this pentagonal tiling in 1918. Nearly 100 years later you can now 3D print it as a bracelet for some serious geek bling.

This model 3D prints as a flat strip. Get a mug of very hot water and use it to heat and bend the bracelet to fit your wrist. It's easy!

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Reinhardt Pentagon Thermoform Bracelet by mathgrrl is licensed under the Creative Commons - Attribution - Non-Commercial license.