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The rotor seems pretty solid. We have not calculated the RPMs but have confirmed it is pulling enough Gs to create a decent DNA pellet at the bottom of a test tube which is why we made it. Future modifications may include a means to measure and also set RPMs/Gs.

We won't be doing any other rotor configurations unless the need arises, mainly because of the potential of failure increasing with complexity when 3D printing.

We always operate it with the lid closed just in case!