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Great points. Very soon we'll be working on V.2 and it will have a safety switch (we didn't know how much interest this would have when we first designed it and it was just for us to use/abuse/and take risks with). It does hurt really bad if you hit your finger with it when it is spinning.

Simplifying the electronics is also on the to-do list. Interesting that you mention ATtiny. We got our hands on some decent developer boards that cost under a dollar and are much smaller. One from TAMI (https://telavivmakers.org/index.php/ATtami) even has a diode for added protection which other ATtiny boards lack.

The RPM question is also a very good one. We'd like to figure out several things. The RPMs, the RPM bursting point of the rotor, and a way to get it set optimally for the DNA extraction procedure it was designed to do (and does well when we set it to maximum) as well as a quick-spin option when mixing the contents of test tubes and especially smaller PCR tubes (which will require a second sort of rotor).

Stay in touch and if you decide to build this or improve upon it, please let us know. We'd love to see it.