Hello. I am new to 3d printers and have purchased a He3D Prusa xi3 kit. After assembling and reviewing many related blogs and homepages, I managed to make the step motors and heaters work. And the steppers work in correct directions,after jumper and trimmer settings. However, there is a big problem. Although I have wired the Z axis limit switch correctly and uploaded the firmware from Arduino asby intertech - General