MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
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I'm actually not sure what voltage rating my steppers had (they were salvaged from old scanners). However, the nice thing with the Polulu A4983 stepper motor drivers is, that they have current limiting build-in. You can adjust the maximum current with the tiny potentiometer. Just start with the lowest setting and increase the current until your steppers work reliably (and the A4983 doesn't overheat). With the low torque needed for the SphereBot, this shouldn't any problem at all.