Look into battilizer. I'm using it now in a class for applique but it should work for machine embroidery. My instructor has assured us it's light enough that you can use regular batting when you sandwich the quilt. We are cutting 14" squares and spray basting background material to it then after machine quilting an interesting background design we trim the block down to 12 1/2". It comes like regular batting in a roll - 22" wide. It's on the expensive side but it's real easy to work with. It gives nice definition to the block without creating a lot of bulk.