Mount opto-stop
thingiverse
Mount an opto-stop unit for the Z-ax to get an reliable zero-position for the extrudernozzle versus the bed. I used the opto-stop from Reprapworld.com which is quite cheap (€ 7,10) and very reliable. Can easily be mounted together with the Z-motor bracket. The opto-strip should be black or blackened for optimum result.
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