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 do not need a voltage regulator. Input voltage for D4r-ii is 3.5-10V. Specs I have for the ESC say it is compatible with 2S LiPo. I’ve been running my setup with no voltage regulator without issues.