The RAMPS 1.3 kit sucks. You need to cut both 40 pin female pinheaders perfectly, or you will be screwed. Whenever you look this up online, you find that it is easy to cut pinheaders. They also say that you will almost always loose the pin next to where you cut. Just try and cut twice in these things and have all the sides turn out. Just try. Impossible. Bastards. They will get no more business from me.