|I know I shouldn't, but I really use thread on wooden spools. It's mostly for doll clothes and zig-zagging the edges of new material before it goes into the wash, but I have so much from various second-hand sources, it seems a shame to toss it.
One thing, though, it's usually quite dusty, and the fibers tend to shed, which gets the dread enemy dust into my new machine. So I made up a new little rule - every time I change the bobbin, make up a new one, etc., I have to 'sweep' out the bobbin area with the miniature whisk broom that came with the machine. Averages out to at least twice a project, and my projects are usually quite short. While I'm at it, I also clean the throat plate and feed dogs. The mini dust bunnies that are liberated get to continue life in a peanut butter jar with their friends for a while, before I toss 'em out with the regular trash.
It's actually quite fun, and I could be accused of making small bobbins so I can whisk out the area more frequently !