I've done it both with and without. I like the ruler in the fact that it has the lip that catches on the paper and you don't have to guess. And you can instantly see if you have enough seam allowance. Sometimes the paper and seams get in the way and you "think" you can make it until it comes of out of the wash with a frayed seam showing. But its like anything else..you can do it without it.
Last edited by RkayD; 11-04-2012 at 11:27 AM.