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.
I see what you meant. In a purely magnetic "motor." I thought you were referring to these electromagnetic/permanent magnet devices. My mistake.
Degaussing is an issue for these devices as well. On the well designed versions, the coils are pulsed in patterns to deliberately oscillate the field and "re-shape" it as it goes but that only goes so far. Higher quality magnets kept cool(er) can go a long way.