Many years ago I sewed everything with all purpose thread that was fairly inexpensive and my old singer was happy with it. I stopped sewing for about 10 or 15 years and bought a Designer 1. I love the machine, but the machine is a bit picky about threads that it will use. Especially for quilting. I no longer have a stock of threads to use and am stunned by how expensive it is now! I found this web page that gives pretty good info on different types of thread.