Hi,
is your H2D also “buzzing” a little when on and just idling?
BR
Yes it is! I got mine two days ago and i noticed this too.
Best way to keep it from buzzing is just keeping it printing, so that you dont hear it buzzing. 
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Also my printer, but I started to notice it after upgrading to the latest fw beta.
It does buzz. Pretty noticeable and persistent frequently.
I don’t hear any noises from mine at all when it’s idle. I turn it completely off when I’m not using it. I am on the latest official firmware, no beta.
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To those who notice buzzing are you powering the printer via 120 or 220?
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In germany (my case) its 230 Volt
Mine does this sometimes. Seems like a sort of station-keeping noise. I’ve listened to it for many minutes wondering if it would ever stop and it has every time after varying lengths of time. I think the last time I heard it, it buzzed for something like 20 minutes then stopped.
Danger! Danger! High Voltage – as Electric Six once said.
I’m on 230 V here (IEC 60038:1983).
No offense to those still saying 220.
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