This is a "filter" for when you roll your joints. It will not actually filter any smoke, but it will keep it having good airflow. Version 2 protects your mouth from debris. Air drag is increased because of the "filtering" action of the new model. Enjoy! Warning: Don't print in ABS as it is toxic when incinerated. Print with PLA. 100% Infill 1 Shell .2mm layer height No Supports Warning: Don't print in ABS as it is toxic when incinerated. Print with PLA