For the Husqvarna Viking Epic and the Pfaff Icon machines -
Changing the Bobbin Case - The Epic and creative icon™ comes with two different bobbin cases. Bobbin case (#1-gray) is mounted on the machine at delivery and is used for most sewing and embroidering. The second bobbin case (#2-black), is the Straight Stitch Bobbin Case. This bobbin case is recommended to use when sewing a straight stitch that has moved its needle position to the left. A symbol will be shown in the information area on your screen when the Straight Stitch Bobbin Case is recommended.