I have used pcb heated bed in past. They were made locally and always got wrong resistance and they didn’t heat up. But I feel that is because of my printing surface or lack of insulation. Can some one tell me definitive setup for printing surface. Considering I am using pcb heater what insulation what should be layers like what bed material which kind of tape and slurry or glue etc. for surface I hear glass alu and circuit board material as afinia. I need setup both for pla and abs. If top of bed needs to be change if material changes its ok.