When cutting fabric with a rotary cutter and ruler should the ruler cover the mark on the mat or just butt up against it? I have just noticed that my mat does not go end to end but actually starts where the markings start almost 1/4 in from the edge of the mat. That explains why some of my projects weren't accurate (when I thought I was being so careful. Us beginning quilters need all the heads up and help you can give us.
Sally