OK, so I read that you can desolder d1 and just run the unit off of usb as well as the power supply. that's what I've decided to do for now as it is the quickest way of getting up and running. I'm having trouble now with repetier host and testing everything. no matter how I wire the stepper motors or what button I push, the hot end always moves down towards the print surface not towards the end stops. if I manually trigger one of the end stop switches it stops as it should but I just cannot figure out why its moving down instead of up.