I too have a Janome 6600. I use quality thread, but it still gets linty very often. Just finished a quilt top for a double bed and had to completely clean my machine 3 times. Lots of lint everywhere, then the thread just jams up and won't sew. My husband thought maybe there are some rough parts in the mechanisms and that is causing the thread to cause so many problems. Sounds good to me. Would never buy a Janome again. It can't hold a candle to my old Pfaff which I still have and use as my "traveling" machine.