I made a nice upgrade for my good old Prusa i3.
Auto bed leveling with an inductive sensor (NPN).
http://www.ebay.de/itm/271696655289?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
The sensor works fine with 5V, so I could join him directly at the Zmin connection. I use a e3d v6 lite Hotend.
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Prusa i3 Auto Bed Leveling
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