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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Hi. Thank you for your remarks.
You are mostly right. It's high voltage. That's why I wrote several times about risks for non-skilled users.
Grounding - my printer IS grounded and came grounded from the factory. I believe it's even required by EU regulation.

Ground cable is connected to psu chassis and whole frame through mounting screws. On the top of this everybody should have differential switch in home electrical system.
In summary power cable shorten to the frame will immediately trigger home safety system.

I will prepare low voltage version and publish it soon.
Added announcement about this in thing description.