Step 1: To Make
Heat wax. Careful not to catch it on fire. I do this outside for a reason.
Mix in saw dust.
Let cool to the touch but not to solid.
Lay out coffee filters and put mixture into middle.
Roll them upp tight. Wax should soak thru the filter.
Let them sit for a few hours.
Step 2: About
The saw dust can come from a range if woods. Just make sure it's not treated or finished material. If I need to cut something treated or finished I will empty my current dust bag and save it before hand. But being that I don't have much call for cuts on either in my guitar shop, I don't have to do it often.
Doing a timed test today half a stick burned for 18min.
These are great for camping, fire pits, charcoal, you name it.
If your mixture is crumbly you need more wax. If it is rock solid and doesn't light well. You need fire fuel (sawdust)