Yikes!
I now clean mine out after every two hours of sewing. More or less.
I remember when I first got my first machine I didn't even know you were supposed to clean it. I happen to be in a dealer's store and noticed her taking off the throat plate on a floor model that was the same as my machine.
She kindly showed me how to do it.
I went home and removed the throat plate on my machine.
And it looked worse than that picture above.
PACKED solid. No wonder it was making all kind of weird noises. :roll: