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This is a simple Fidget Spinner which is able to run with only one bearing. It's ergonomic shape and light weight makes it easy to use even with one hand and if you get hit with it it doesn't hurt. The shape is inspired by a shuriken, so even it's simplicity it's still cool :). The whole design process is uploaded as well: https://www.instructables.com/id/Mini-Shuriken-Fidget-Spinner/