The default on mine is 2.2 which I think is too short for quilting. For a quilt with the thinnest Quilter's Dream cotton batting I used 2.5 and for a quilt with the Hobbs Heirloom I used 2.9. Cut a square of batting 4 to 6 inches and use some scrap fabric and test and see which you like best for the project you're working on.