Hey everyone! I recently purchased a Wanhao duplicator i3 v 2.1, and I have a problem with the bed level. I can adjust all of the thumb screws in each of the 4 corners to level the bed to the correct height when the nozzle is in any of the corners of the bed. However, if I move the nozzle to the center of the bed after this leveling process, then it is too close and hits the bed. So I can adjust it so that it is the correct height in the center of the bed, but then the nozzle if just too far from the bed as it leaves the center. I guess my aluminium build plate could be warped? Anyone have this happen to them, or know a fix? Thanks, Eric