Greetings. I have been along time visitor and just now registered. I have a question about the ramps 1.4. I am building a reprap as well, and am using the same electronic package as you. When I turned it on however, the z axes dos not work properly. With 1 stepper motor attached, the motor will rotate when prompted to by pronterface, however with two z axes stepper motors applied , they will not rotate, instead there is some chatter, and finally they stop responding and the system must be reset to get them to work. The steppers are not physically attached to the threaded rods, so it is not mechanical binding. This only occurs on the z axes. Have you experienced anything like this and have any advice?