I can't get mine to wind the bobbins for the Juki 2010. It does the Pfaff well. I like it when using the embroidery unit.
I find that strange, as I can wind almost any bobbin on my Pfaff 2170. I have a lot of cheap metal bobbins that I wind for the serger if I need a certain color. Since the bobbins go on the looper spool holders, it doesn't matter what they fit originally.