Why has the XY-Microswitch PCB only 4 pins?

The X and Y switches are sharing the same ground potential on the PCB, so the second GND connection from the controller board isn’t needed to be wired to the PCB (you can choose if you wire in the X or Y GND). The Vin potential only needs to be wired to the toolhead if you are planning to use the hall-effect endstop PCB in future, it is not needed for the XY-microswich endstop. The fourth Vin pin is just a “parking” position for the Vin wire.

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