I used CT blue for the denim quilt I made for my grandson, and the lint was terrible. It wasn't from the denim, because I was using much washed old jeans, not new fabric. I much prefer Aurifil. I clean the bobbin area and behind where I can reach every time I change bobbins, but I wonder what's happening where I CAN'T reach!!! I'll take my machine to the dealer for a 'tune up' after the holidays. I'm curious to see how much lint he'll find.