I use flannel all the time. Prewash if thin/ loosely woven. ( I don't prewash multiple times- see no reason to wear it out before using it. I purchase thick, scrumptious soft, cuddly flannels) Starch well & iron before cutting. Clean bobbin area of machine with each bobbin change. Start with new needle. Change needle after project ( flannel seems to dull my needle faster than regular cottons) I Love Flannel Quilts!