I think you're probably ok, then. I wonder if a modification to your design might work - extending the nut capture piece more along the front and back of the nut, so that it is free to slide left-to-right, but has less room to rotate.
You might also jsut try adding more lubrication to the z-screw. My nut seems to have quite a bit of freedom to rotate if I grab it by hand, but in practice when turning the screw it doesn't move. I guess the friction within the nut is less than the friction between the nut and z-stage.
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Nicolinux 288
Yes, the brass nut is centered on the z-coupler at the bottom and the banding/z-wobble artifacts are gone.
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