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.
A small bar of 7 segment displays or maybe even an LCD display to show the current RPM would be a great addition to this. As far as i remember there are different RPM settings for different experiments...
If you go for an LCD you could also display how long it is switched on so you don't need a stopwatch next to it.
Sure this would have to be configured to fit the motor used, but that should not be too hard.
An emergency stop button would also be nice (instant motor off, reset kill command once pot is turned down next time) would also be a nice feature.