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This is a fidget spinner I have designed to use in labs for centrifugation. It is used to centrifuge 2 mL and 1.5 mL Eppendorf tubes. I have also made some adapters to use 500 microL tubes. And to finish I have designed bearing caps with tools from labs: an Erlenmeyer flask, a pipette, and an Eppendorf tube. If you want to see more about this object, you can read the full article here: https://www.instructables.com/id/Lab-Centrifuge-Fidget-Spinner/