Originally Posted by
PaperPrincess
I don't press my seams open, I press to one side. I am careful that one row is pressed to the right, the next to the left. This way the seams nest, minimizing slipping. Also, if it's possible, feed the row so that the loose edge of the seam on the top gets fed into the presser foot first. The feed dogs will pull the seam on the bottom butting it closer to the one on the top. It's not always possible to do this, but I try!
I agree. I also wonder if your seams are sewn consistently at 1/4 inch, if you are careful not to let the end of the seam slide a little at the end of the square as it feeds through the pressure foot and careful not to stretch your fabric (starching helps this).