I always recommend using a one piece batting on all quilts that are going to receive heavy use. If you decide to piece together your leftover batting, do not use iron on tape. The iron on tape does not hold batting together as the batting is not stable and the tape will separate from the batting. Instead butt the pieces together and run a zigzag stitch to secure the pieces together. This will help prevent the longarm stitching from having stops in the middle of the stitch design. My goal as a Longarm stitcher is to not have any stops.