Originally Posted by k3n
I have the 6600 and no problems with my bobbins. I assume you've taken the plate off, taken the bobbin case right out and given a good clean all around the works with a brush? Otherwise, perhaps you are not winding the bobbin correctly - you have to thread a length through the little hole in the bobbin and hold it between you fingers then wind a few turns to secure it. Stop the machine, trim the thread end off then push the button to finish winding. I'm sorry if you ARE doing this then ignore me. :-D
The SQA are different than the normal class 15s. The gals at my LQS where I purchased it have said so. Believe, me I know how to wind a bobbin. I have rewound my bobbins for my SQA so many times I lost count. The only thing that helps me is a little (a 1/4" if that) piece of thick tape, right now I'm using the seam allowance tape, in the bottom of the bobbin casing. It seems to keep the bobbin from jumping around and I've had no problem with it since. Before that the darn thing would skip out of the guide and the thread was being fed off the front (towards you) instead of the back. Sounds crazy but it works for me.