Prusa i3 Z end stop
thingiverse
I'm looking for an adjustable Z end stop that can work with my X ends, and I think I've found the perfect solution. This thing from Thingiverse caught my eye: http://www.thingiverse.com/thing:1060290. It's a simple micro switch that would be perfect for the job. I'd recommend using one like this mini-micro-switch PCB-mount from GrabCAD: https://grabcad.com/library/mini-micro-switch-pcb-mount-1. Or, if you prefer to shop around, Hobby Components has a great option too: http://hobbycomponents.com/switches/531-3-pin-micro-switch
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