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Thanks for the advice. We're working on an electrophoresis system at the moment. When it is done we will begin on V.2 of the centrifuge and will definitely ask you about the ATtiny as it is of great interest to us for a variety of projects.
The bursting point of the rotor is just a matter of curiosity. The current rotor/motor arrangement + the 2mm cover should be more than adequate. But we'd like to look into it just to assuage the concerns of some of the more cautious people following our project.