I could NOT figure out why I was getting such crummy results as far as my block size!!! Thought it was mt seam, bought a 1/4" foot with a guidr, thought it was my cutting, bought a slotted ruler, thought it was my pressing, bought a new ironing board. But what seems to have fixed it ( thus far, knock on wood) is the $.99 can of starch!!!! I am simply amazed at what a difference that makes!!!