Try this: Cut 4" strips first then the 2" strips from those. The general rule is you need to re square up the fabric cutting edge after cutting the amount of strips that equal the width of the strips. ex: 4 inch strips re square up the cutting edge after 4 cuts. Cutting 2 inch squares you will have to re square up the cutting edge every 2 cuts for perfectly square shapes. I learned this in a quilting class long ago. It could help.