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It's not a mechanical switch, it's some kind of infrared distance sensor on the bigbox.
It's definitely on z- but doesn't seem to be triggering.
I've now got the printer up to the state of moving all axes and heating, which makes me very happy (thanks e3d for the fast replacement...
Still in the process of building my bigbox but I have found what I think is a slight bug with one of the cut plywood parts.
On one of the plywood...