Finished building my preorder BigBox 1.1 and have been trying to tune out some z-banding. In my test cylinder I have the light to highlight the surface quality. Near the bottom the quality is good and gets progressively worse near the top. You can also feel this by hand, so it's not from how the lighting is. I was pretty careful during the comissioning to make sure nothing was binding. Anyone have suggestions on what to check? Thanks!