Hi! I have a Prusa I3 Mk2 and I can’t get the z axis aligned…the front and back 3 points work fine (the head bounces up and down), but the middle 3 points grind and the head pushes against the board. This recently just started happening after a bad print…could my board be warped or it there some other problem. It’s hard to tell by eyeball

since you have a prusa why not contact prusa support?