Quote Originally Posted by Turtle Feet View Post
I don't mark seam lines - check the measurement from your machine's needle to the outside left edge of your pressure foot. Most are 1/4", the same width as your seam allowance.

In other words, just line up the raw edges of the seam you're sewing with the left edge of your pressure foot and - voila - just sew.

TF
That's a fine method until you need to do interior lines like the baffles on a quilt or some other kinds of constructions. Then it is really extremely helpful to have the lines marked.