2lt bottle full face filter mask

thingiverse

This is a comprehensive facial filter mask created using two-liter soda bottles and diverse filtering materials. The valves are one-way and seamlessly integrated into the connector. Filter retainers keep the multiple layers of filtering material securely in place. If you already have a commercial filter canister, I've included a 3M to bottle adapter that you can utilize, but you will need to cut a sealing gasket from L200 foam or another high-density foam for the canister side. Additional materials required include half-inch elastic and a pop rivet tool to attach the four buckles. In my prototype, I employed a paper coffee filter, charcoal filter sheet, and high-density cloth as the filtering layers.