and check if your z-nut has any play.
Changing to a proper z-nut can fix your problems.
If the z-nut has some play and the bearings 'hang', you will get banding. You can simulate this by pushing a little underneath the bed when the bed moves to the next layer. The next layer is printed on the same height as the former layer due to the play of the z-nut, until the end of the play is reached. I think you can have crappy bearings with a good working z-nut....
I bought some at http://www.technobotsonline.com/tr8x2-travelling-nut-for-threaded-rods.html
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Labern 775
Having a bit of new grease will loose any dry bits and help with cleaning. You can hold a cloth on the screw near the build plate and raise the build plate with the other hand. This will make the screw rotate and help in wiping inside the threads. You can then use a clean piece of cloth and do the same underneath. Then apply a small amount of new grease.
I think your problem maybe with the linear bearings on the 2 guide shafts. Do not grease these but you can test them to see if one is causing your issue.
You need to remove the cover and unscrew the bearing from the build plate. then slide just the bearing up and down the shaft to see if there are tight spots.
To change the bearings you unscrew the black plate underneath the machine and slide the rod out. then you can remove the bearing.
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