Here's a quick tutorial on how to add some ventilation to your helmet.   *EDIT - I just noticed CheckWan had posted a similar thread in April (I didn't scroll far enough) but if you prefer a photo step by step here you go. Also I found my fans on AliExpress, 5 for $6.50 with free shipping. Shipping took 4 weeks from China to the US but at the time I was still building my armor so I didn't need them right away.     I used this set up on my first troop that was a 1 1/2 mile parade in 96 d