With DH in the room rushing me and not having read all the posts, I have to hurry. Maybe I am saying what others have said. I usually have 3 or 4 projects going at one time--quilt in progress, patching or repairing jeans, making vinyl covers for this and that, and a garment in progress. I can't afford the time to thread, rethread, etc. I have 3 machines set up and 2 sergers. One serger has only black thread most of the time. No matter what job I have to do in a hurry, one machine will have the right thread.