Fairly self-explanatory. Sized for a regular Bic lighter, this adds a small water tight storage compartment. Hole at bottom of lighter compartment is to push out the lighter when it's dead.
Print the cap upside down and the main body right size up. Variable layer height is your friend for getting good results from the threads without taking forever on the body. Give a spray of poly to ensure water-tightness.
The author hasn't provided the model origin yet.