Awhile back, there were instructions to use your dsm to do this stitching. I think it called for monofilament on the top and colored thread in the bobbin. Or was it the other way around? One had to adjust the bobbin tension to get the stitch. Not sure about the top thread tension.
Do anyone recall this idea for sure? How successful?
That technology has been around for awhile. I know Pfaff had machines doing that since around 2000. Those machines actually sewed a normal straight stitch, but with every other stitch being made with the monofilament (invisible) thread. This Babylock Sashiko does not use monofilament thread at all, and it actually makes a stitch, then skips a stitch, just like hand quilting a running stitch does. This is a big improvement over that previous technology. I never wanted monofilament thread on my quilts. This I like.