MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
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.