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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. https://youtu.be/30R_qpk--as
Prusa i3 Auto Bed Leveling
Order summary

Prusa i3 Auto Bed Leveling
Color:
Quantity:
Subtotal
$
Delivery (May 04 - May 06)
Free
Total
$