This is the reason why I keep my empty NEB pre-wound bobbins. They're great for just needing a little thread for a mending job. Right now I'm using the leftover embroidery thread to piece with. I'm working on some PP sections so usually very little stitching on each piece so using up the thread is a quicky way to empty them completely. I find at the end of the NEB bobbins the thread seems to get caught up so rather it happen while I'm piecing than when I'm working on an embroidery project.