For me, the case size varies by order. But my most recent order seems to be smaller than previous shipments. I don't alter the size of my covers before printing. I print it out as is, and simply cut off a super small fraction off each end. It's so small, it isn't noticeable, but it allows the cover to fit without the paper getting wavy. You will have to experiment to see how much needs to be trimmed in order for your covers to fit with your specific cases.