I just setup a new Egg Bot and the pen servo does not move up and down. I can control the Egg Bot with Inkscape and it will plot or at least the step motors move. The pen servo does not move. If I unplug and plugin the servo, it will raise. It will raise again if I repeat. I'm on a mac but I doubt that is the problem since the step motors function. I will try on windows. Any ideas? Maybe it's just a bad servo.