So recently on one of my Robo3D R1s, the back right corner of the bed is not adhering. It looks like the z-offset is incorrect, and the print head is not printing close enough to the bed, but it only happens in one corner. I have used a level to check the bed and the x-axis, and as far as I can tell, it is level. Also, it seems to me that if the x-axis was off level, it would happen all along one side, not just on back right. Also, when I manually auto-home and then move the print head to that area, it seems to be the right z height. It only seems to happen during prints. Is this a problem with my auto leveling? Edit: Forgot to mention, I am using Simplify3D, with a G29 command in the startup code. It is ABS filament, extruded at 230C and bed temp of 80C with hairspray on the bed. I have done several successful prints using these settings, it is only when the print is big enough to go to the back right corner that its a problem.