I've been using the OhmEye Z isolators to help remove any Z banding on my MM2 printer. https://www.dropbox.com/sh/3uyotd400xp2ef5/2pLnjCypcV/STLs/Z%20Isolators/ohmeye_mm2_isolator_release%202x.STL
I did notice that his one pad design puts it right under one of the screw holes possibly allowing the isolator to key into the hole and thereby reducing its effectiveness. I modified it to have two pads spaced between the screw hole.
Update: I have added a few other variations on the original. Personally I'm using version 3, as it has the bosses evenly across the leadscrew and out of the way of the lead nut bolt holes on the X axis.
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