Although my CR-6 SE has automatic build leveling (which works great), I wanted the surface to be as flat as possible. I was expecting the original hard spacers to keep the aluminum from warping when heated, but somehow I think it warps even more over time. I left two rigid spacers in the middle of the bed and replaced the rest with silicone spacers. They provide just enough tension for me to easily make fine adjustments around the edges, even if the bed warps again.
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