The Squeeze-Fan is a hand-powered fan that converts linear two-directional motion into rotational one-directional motion.

It does this by first attaching the hand lever to a gear rack, which spins a gear. These are geared to increase speed and are connected to a ratchet and pawl mechanism. The pawls are mounted to the edge of the gear and engage the ratchet due to centripetal force. When the pawls are engaged, they transfer rotation to more gears to increase the speed until it reaches the fan. When the lever is released, a spring forces it back out and rotates the initial gears in the other direction. However, the pawls disengage because the direction is wrong, meaning the fan can free spin due to its inertia.

All parts (minus the screws, which are used for mounting and axles) are 3D printed out of PETG.

All parts were modeled by Devin in Solidworks and 3D printed on his Prusa i3 Mk3S.