Stitch 124 Someone may have already made this statement, I have not read all 10 pages of posts. Here is my thought on what you instructor was saying. When you do a project keep using the same ruler and cutting mat, not a certain brand. Although rullers and mats should be the same they may not be. SOOO do not change rullers and cutting mats during a project. I have many rullers I try to use the same ruler and mat I start a project with if I do need to use a diffrent ruller I try to use the same brand as the first ruler I used. I hope this helps. yippie