I am using Aurifil cotton 50 wt and am having to clean out all the bobbin areas of lint. I firmly believe that cotton thread, no matter who makes it, can be linty. And that reminds me that I need to get DH to take off the cap end of my Brother InnovisD (there's a little screw on the back that holds it all in place) and check that upper tension and take up lever area. I'd rather check it before I have problems than after and it's been at least half a large cone of thread ago. His work is free and the technician will cost me at least $125.