The mouth bellows are a simple nozzle you blow through that directs your breath through a narrow channel, speeding it up. This increased velocity of your air stream leverages the venturi effect to pull additional air with it, into the embers. Get your campfire going in record time!

Versions:

The standard includes two holes for standard paracord, to attach the bellows to your bag, hang around your neck, wrist, or anywhere else you'd like to have it easily within reach. 

Alternatively, print without the paracord holes for an easier, cleaner print. 

Printing:

The version without paracord holes can print without supports, but a 3-5mm brim helps with adhesion. 

The version with paracord holes benefits from supports, as well as a 3-5mm brim.