Melt the beeswax (or candle bits) in a double-boiler.
Cut lengths of kitchen twine for wicks, then soak each piece in the melted wax for about sixty seconds. Stand one wick in the center of each liner (the wax coating helps it to stay upright).
Carefully pour the melted beeswax (or candle bits) into the liners, filling almost to the top. While the wax is still soft and warm, press in your chosen add-ins.
Once the wax has fully cooled and hardened, pop the firestarter out of the molds. If they’re in paper liners, leave the liners on - they burn just fine and add a bit more fuel.