That's why I use the Go die cutter. At least my cuts match each other perfectly. I took a precision piecing class and the most important thing after accurate cutting was to sew S L O W as slow as one stitch at a time. If the fabric pieces to not match like they are suppose to, stop and find out why. Don't keep sewing more. It seemed like it would take forever to make a top this way but the more I did it the better I got at piecing. No frustration of miss size blocks made up for the extra time.