I am in the middle of setting up my very first 3d printer(a pursa i3 mk 2 i think), I have no real idea what I am doing, and I followed the instructions exactly but whenever I try to home any of the axes it goes the opposite direction and continues to hit the wall and on top of all of that the z-axis won’t move at all. please help I have been attempting to fix it for days and don’t know what I’m doing wrong.