Originally Posted by Jeanne girl
It doesn't matter what length the stitch is set, when you free motion, your feed dogs are down and you control the length by the fastness or slowness that you move your fabric under your open toed darning foot.
That is only true for some machines. Others MUST have the stitch length set or the stitches will be anry little bites in the fabric. On my Babylock, I set mine to 3 or 3.5 mm and do quite well with it.