Hi. So I'm building a 3d printer based on rat rig v-core v2 500x500x500mm core xy build volume with bed frame 529x529mm and 4mm aluminium bed. Now i need something to put on bed but i can't find something good and i need some help from you guys. Buildtak is expensive like hell. I can't find borosilicate glass in my Country in that size. I found a glossy carbon plate but its around 250 euro. I thought about prima creator flex plate 510x510 with a thin pei sheet but I'm worry about durability of pei sheets.