I am in the process of installing an oversize heated build plate on my large FDM 3D printer and thought I would post some photos since my work had been (rudely) interrupted anyway. I will post more technical details and probably a video of it in operation once I get it going.

Back of build plate showing 350mm x 350mm 800W heater.

Back of build plate showing fiberglass mat insulator and hardware.

Build plate mounted on printer.