Hi, i’m having a small problem that i don’t know how to fix it. My print, every single one of them, a corner always lifting. Not that much, maybe 1mm top. But that enough for my to add some sanding job at the end to make it flat.Is it my bed that isn’t perfectly leveled? i’ve disable the cooling fan and using glue stick with glass bed with temperature of 20. http://ift.tt/2cOsSK7