Gridfinity stacked warped

For the first time, I tried out the stacked no-support light gridfinity base plates. Half of the plates were warped in the MIDDLE of the stack. The plates on the base and top plates were ok. (They all separated ok.)

I used the Bambu smooth hot PEI plate with their green glue. I am reprinting using the cool smooth Bambu 35° plate.

printables.com/model/725407-gridfinity-stack-printing-baseplate/files