Professional DIY welding helmet.
thingiverse
Manufacture of a professional welding helmet, ensuring the supply of fresh air. In addition to cleaning the air, it cools the inside of the helmet. Apart from the helmet, I used a HEPA filter, a fan, a PWM system and a battery from the drone, and a pipe from the gas mask. https://youtu.be/2Ws8RQtZTp8
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