Blue wire should be toward the outer edge like you have it. The middle wire should be black. I wired my switches incorrectly the first time as well. The writing on those little switches is too tiny for me to read without my magnifying glasses. My eyes are not what they used to be. For my switches, I wired the black to the side that the metal is attached to the switch itself. The blue wire is on the other end where the metal sticks up over the tiny button/contact. When mine were wired the other way I tried to home any of the axes and they would only move a tiny distance then stop. In order to make them go all the way home I would have to keep hitting the home button on Pronterface. After I wired them up correctly it worked as it should.