At the first attempt I make calibration and bed mesh, when I got the same result as most of the part of the community.
I did check bed plate and seems it is ok and it is not possible to get something like “taco bell“ what talk all about - aluminium plate can’t curl at that temperature (may be I’m wrong).
Yes, my construction of the bed is little bit modified (now it is stock) and I have the bed on 4 springs.
The general issue here is “taco bell on PEI sheet because it can’t be located properly on the bed because it doesn’t fit into the recesses made in the plastic protection around the bed.
As a result, the plate’s ears stick out beyond the bed and disrupt the bed’s geometry when get the mesh.
I had a similar problem when using an industry standard 165 X 165 mm PEI sheet on my Zero. The Zero build plate has the two finger tabs on the left and right and the plastic frame has a tab that protrudes upward in the center that doesn’t locate the build plate or align it to make it easier to install. The only purpose seems to be preventing the use of existing build plates for the Adventure 3, Ender 2 Pro, et cetera, so I filed off the plastic tab on the front of the frame when I was leveling the Zero’s print bed.
