So I torn down the bed entirely. It’s actually 3mm thick aluminum PCB. Without taking apart it looked thinner due to milled areas around the holes. Plastic base is actually not rigid at all and warps like banana with aluminum PCB/plate unscrewed. So it’s more like simply cover for electrical insulation. I doubt it can warp the bed itself as triangle frame is screwed directly to aluminum PCB. Also plate is not quite leveled with recesses in plastic base. Plate is recessed by about 0.3mm on average. Not to say plate is warped even when taken out.
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