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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.

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You could also use the Raspi hardware PWM.
It got two pins for that so no need of an Arduino I used them a while ago... it worked flawless
The only Jittering appered under havy load