Hm, I measured the distance between the rods at the top, bottom and center. The deviation is less than one tenth milimeter...
I don't need the last 12mm - I just have a bad feeling knowing that there something wrong that I can't figure out.
Thanks for the tipps about the shims.
The grinding sound is the stepper motor missing steps. It's not serious.
The two vertical rods probably have a different spacing at the bottom of the UM than the spacing for your bed. I fixed this by putting shims on the "left" arm of my bed. I made sure it fit before I finished assembling and did this with the z screw removed.
The design of the bed I believe is supposed to allow this spacing to change as the bed goes up and down but I didn't like that idea and tightened it up good and tight but with shims spacing the arms farther apart.
If you don't need the last 12mm then I wouldn't worry about it. I have not yet needed to use the full 200mm in Z.
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