I've found that I have to be consistent in where I stand in relation to the ruler. I found that by shifting a little left or right changes the way I line up the markings. It doesn't sound like much but I can be off by 1/16 for a few cuts and that starts showing up very quickly when the seams don't line up. Frustrating. I now have a small rug that I stand on to mark my position in front of the cutting area to make sure I stay in the relative vicinity. I know this sounds way too picky for some but it works for me.