I recently ordered a new sewing machine and I'm not sure what size thread spools I can use on it. It comes with the small, medium, and large spool caps and has a vertical spool pin. The sewing machine is the Singer XL-580 Futura. I decided that if I was going to spend money on a machine I wanted something I could grow into and this is what I decided on! Singer is backed up and I haven't received the machine yet, but have started on cutting the fabrics for my quilt I was going to make. I was hoping to have everything that I needed before it got here so that I could start.

Does anyone know a general guideline that might help me?

Thanks in advance!