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[printbus]

I have downloaded and printed out your X and Y brackets, but I keep having trouble mounting them. It seems I cannot get the screw tight enough to keep the bracket from moving, even after REALLY torquing down on the screw. I think I actually crushed one Y bracket by tightening the screw too much, but it still was loose on the extrusion. I got the X to stay put somehow, but the Y won't cooperate. Any suggestions?

Your screws may be bottoming out in the V-rail. I noticed that possibility during my i3v build. Look where you've tried to tighten something to the rail. If you see a circle being cut into the bottom of the channel where the nut plate rides, that's what is happening. If so, add a washer under the screw head or file the screw shorter.