Hello,

I´m building an Prusa Mendel i2 right now. I use an Ramps 1.4 with the a4988 stepper motor drivers. The problem is that when i connect both z axis motors to the bord they don´t rotate and do a bad noise but when i disconnect one motor the other motor works really good. Knows somebody the problem?

lower you max feed rate for Z

hi im having the same problem as this guy i lowered my max feedrate and still only one motor will work