RepRap Mendel auto bed leveling
thingiverse
Based on the concept at http://www.thingiverse.com/thing:273805, I've designed a variation suited for my RepRap Mendel. Follow the instructions from the original source, but note that I employed SKF's POM 8X10X12 linear bearings, an M5 nut fixed with an M2.5 screw and nut, and the Mendel's Z limit switch (inverted from Normal Closed to Normal Open). This setup not only enables auto bed leveling but also facilitates zeroing without adjusting the limit switch position on the Z shaft.
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