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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Oh sorry, didn't answer all your questions.. 20m tether see link in above comments, my motors are 750kv but really it doesn't matter so much, so long as the prop loading isn't too high. 800kv is entirely fine.