I roll my clay out on my pasta machine on #5 thickness. Then depending on which size I want, I will try a couple of sizes and see which way I want to go. Larger or smaller. You can also combine 1/2 of a piece or another whole piece to create an in between size. By using the straws, I am able to get the same size for each piece. No more guesswork. And straws are everywhere.
You might want to try different pasta settings to see what works best for you. Lots of possibilities here. Enjoy.