I been printing PLA for a while now with my craftbot and Its perfect but heres the only problem, the heat bed takes almost an hour to go from 60 C to 90 C, and printing ABS becomes almost a lucky shot rather than a Joy, but i have no idea how to replace it, so any help on the subject would be appreciated, my bed is 250x200mm(8x10in) and im already checking Amazon for some replacement, thanks in advance.