I don't stack and cut I just cut one layer at a time as I want my blocks to be square. In the past I use to do 2 layers at a time but found that the bottom layer was off when I cut it. I also pull threads across the lenth of the top of the fabric and cut the material so that the fabric is squared. Also I don't have the hand strength to cut thru many layers with a rotery blade, I have arthritis.