I've heard that a copy machine distorts the image slightly. All I do is use graph paper and draw my own if I want it larger. I like 8" blocks really well, so it fits nicely on graph paper. Then (now I confess) I use a copy machine to make duplicates. I don't enlarge it because I want it to end up an exact size. (Now you know what ER nurses do late at night when they have no patients, but lots of patience!) Sara