Each day, I learn another thing about Mama Bernina. Today, I learned that using up whatever I have left in my studio is not a good idea. I was using several different brands of bobbin thread. One of them acted badly when I tried to use it and I had no idea what was wrong. Fortunately, it was not a large spool and I was able to toss out what I had left of it. I ran around in circles and pulled out my hair before I figured out it was the bobbin thread.
Today what I learned is to use standard materials and always use the same stuff when you are learning. Do not try six different things when you don't know what you are doing. You have no idea what the results are going to be and even worse, you don't know why you got those results, either! If it turns out great or turns out crappy, you don't know why. You haven't learned anything useful because you can't do it again, or do it differently on purpose the next time.