I've been making my own Campfire Starter for at least the last 15 years. Somewhere along the way, someone shared this idea with me, and I've done it ever since. Not only is it made out of recycled materials, but it works really well to start a campfire!
I always have all kinds of egg cartons around. Most people know we have laying hens, so they save their egg cartons for us. I fill a bunch of them with all that lint and sheets. There's no science to this, just stuff it in there.