The X and Z axis have relatively sane places to put the switch, but the Y axis provided a little bit of a puzzle. The solution was to cut a notch in the Y-axis gantry so that the switch would fit in the narrow space between the gantry and the box that forms the base of the machine.

I notice that in the newest zenbot machines, the left and right sides of the box are gone, with the front and back pieces held in place by the machine table. Maybe I could have done that on my zenbot as well, if I'd thought of it in time.

I intend to also add a Z-axis home switch, but for now the tool length sensor is far more useful.

The home switches are repeatable to under 1/1000 of an inch, which is plenty good for cheap microswitches. I probably should remove the lever from the X axis switch, but not before I do some comparisons to see whether it actually makes a difference.

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X-axis home switch

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Y-axis home switch

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The ratsnest of wires