The helixer!

Its a refillable personal air filter. You will need a bag of activated carbon from your favorite online retailer or an aquarium shop. Does not require supports while printing.

To fill/Refill:

Screw on the outlet screen and pour in some carbon via the other end. tap and shake to get the carbon down to the bottom. repeat this process until full. place the inlet screen on top pointy side out, then screw on the mouthpiece.

Exhale through it to use.