I was missing making a patchwork quilt. But I wasn't prepared for 144 blocks! Who makes a king size quilt with 8'' blocks ?
But I started it so I have to finish it.
Adding these squares on the corners (to make triangle corner) is the only time consuming step.
But there is a way to speed up the process. Without drawing a diagonal line on each square or fold the square to make a crease.
This is not my invention, I saw it on many sites on Internet. Thank you to the clever quilter who invented it!
You have to place a piece of tape on the bed of the sewing machine so that its edge is in line with the needle. It doesn't matter the position of the needle. I keep mine in the center.
While stitching, guide the other (bottom) corner along edge of masking tape. Do not look at the needle. In this way you stitch exactly on the diagonal line without marking the diagonal.