Handheld airsoft goggles defogger: recover your sight in seconds

This goggles defogger is a device with fans and a standard gun battery that I use to defog my airsoft goggles. Unlike masks with integrated fans, this has to be carried on a pocket, but the good thing is that it is very powerful. I carry it in a chest pocket of my vest, and when sweat starts fogging my goggles I use one hand to put it against my forehead so that the two little fans blow air into the openings.

Overall it is easy to use, but requires one free hand. I try to use it only under good cover. Luckily it is quite powerful and can remove all fogging in 5 to 10 seconds.

You will need the following elements to build it:

  • 3D printed body
  • Battery (5-8V recommended) + battery connector (the one in my picture is a male Tamiya mini connector)
  • Two 5V fans. Dimensions must be 25x25x10mm
  • Cable ties + hot glue
  • Perfboard + switch + cable + battery connector (you will need a soldering iron as well)

3D print the body

You can download the STL file by clicking the button below. If you don’t have a 3D printer, you can look for local 3D printing services on 3D Hubs, for example.

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Handheld defogger for airsoft goggles


  1. Start by hot gluing the fans to both sides. Make sure that they are pointing downwards.
  2. Cut the fans’ connectors. The cables’ length must be just enough to reach the perfboard.
  3. Grab a switch (any will do, but try to use a big one that won’t break in the middle of a match).
  4. Prepare the battery connector by soldering two cables to it (about 2″ in length).
  5. Prepare a 40×22 mm perfboard (there are commercially sold perfboards of this size, but the quickest way is to get a bigger one and carefully cut it to size). Insert it into the slot (with hot glue if not tight enough).Handheld goggles defogger schematic
  6. Solder all parts according to the schematic:
  7. Finally, connect a battery and hold it with cable ties using the two small holes that go through the 3D printed body. Try to grab any dangling cables with the cable ties as well so that they don’t break in the future.
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