Here’s a way to piece leftover batting scraps to use in quilts. Overlap two pieces of batting about 2″. Use a long ruler to cut through both layers so they have straight edges. Throw away the waste strips. Cut fusible interfacing into 2″-wide strips. Place interfacing atop the freshly cut batting edges and gently fuse in place using a dry iron. With batting side up, stitch together with a wide zigzag stitch.