I have a printrbot simple metal with a heated bed and no matter what I try I can’t keep abs from warping up off the plate. it seems like I have a hot spot in the center of the plate that I can get small 30 x 30 mm parts to stay down but anything bigger and it puckers up. It will even peel the tape up off the aluminum. I’m printing at 250c extruder and 100c on the bed. .2mm layers and 40 mm/sec. Do I just need a better bed heater? An enclosure? A better printer? A better print surface? Ideas? Chatter?Edit: holy crap thanks for Ali the replies, to answer all the questions at once, I hate abs juice, too stinky. I print with hatchbox abs almost exclusively and I am ordering a big sheet of pei now. Thanks so much sorry I only have upboat I give. http://ift.tt/2cikP9u