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Fine tuning Z offset for Bl touch

Brian Kuehn
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Joined: 2 months ago
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I installed a Bl touch on my Ender 3 pro today.   Firmware update was painless.   Bed leveling is working with 9 points being sampled.   The problem that I have is that I can only adjust the Z offset by .1mm.   I currently have it set to -3.100.  It needs to be a little tighter to the bed but setting it to -3.200 is a bit too much.  It only seems to adjust by .100 at a time.   How do I access the finer digits to set it to say -3.145?   Thanks, Brian Kuehn.