Brush out your bobbin area well and frequently. I made one that was pieced both top and back and all flannel. Left a lot more lint in the race area than any other quilt. Screwed up my tension once because a little blob of lint lodged in the tension spring of my bobbin but it wasn't too bad and because it was my own quilt, I could live with a small area where the tension was a bit off so I didn't rip it.