Defogger fans mounted on goggles

Some time ago I posted a handheld device that could defog goggles when placed on the forehead. While effective, it requires the player to have a free hand and may be awkward to use in the middle of the action. Therefore I designed a new version that can be attached to a very common model of goggles.

The 3D printed part is inserted in the curved airflow gap above the eyes. The small inserts may break due to their small layer surface, so I added holes for reinforcement screws. A ziptie as shown above is also useful for a reliable attachment.

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The fans are 25x25mm, easily found online. They can be secured with 2mm screws (but just some wire wrapped through the holes works, too).

These fans are rated at 12V, but I’ve found that a spare 8V battery is plenty enough. Note that the fans must be wired in parallel (not in series), so that both receive the full battery voltage.