My main sewing machine will sew with pretty much anything, but my embroidery/sewing machine is much fussier. It doesn't like Sim threads, which seem to be reasonable quality to me. Fortunately it does like Gutermann, which is all that I can get locally. It's a bit less keen on Gutermann cotton, which is annoying because I really like embroidery in cotton rather than rayon. There don't seem to be any settings to change to do with cotton vs rayon.