I am in the process of making tons of 2 1/2" hst and I just cut 1 background square and 1 print fabric square (each square would be 3"). Put them right sides together, draw a line down the center and sew 1/4" on each side of the center line. Cut down the diagonal center line and you will end up with 2 hst and this will give you a little room to square up. Hope this explains things well for you.