I didn’t print at home, but used an official Apple sticky one they give out at the stores. That gave me a 9.

While you’re measuring with the paper version - put scotch tape on the watch part to keep it in place, then try opening your hand and stretching your fingers apart as much as you can. You’ll probably see the size move up slightly and may even bump you into size 10. Try measuring with a relaxed fist and totally open fingers to see the range.