The raw material of resin for 3D printing is not good for health. There is a fan's vent in the printer's work space. Thus, I made a box of activated carbon to absorb the harmful substances.
This upload includes three components. Part 1 is the base of the filter box. You just need to put it on the top of the fan. Combine Part 2 and Part 3 to form a container of activated carbon. You may need to glue Part 2 and Part 3. I bought a bag of activated carbon pellets. Therefore, I need to place a piece of air filter on the bottom of the container to prevent the leakage of activated carbon pellets.

P.S. You still need to keep a good ventilation environment!