I've identified the issue as that the spinner propeller at the bottom of the stick is off-center and hitting against the bottom plastic. So we undo the plastic bottom, then push the propeller to the opposite side of where it's hanging to get it closer to center than it was before. Then the sous vide session will be as quiet as circulating water will be.
It'll run just fine for a few more sessions until eventually the propeller has creeped back far enough over to start hitting the plastic again.
Is this happening to y'all too? It's not worth replacing as "broken", but didn't know if this was a widespread thing or not.
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