The FFF 3D printer heats the filament to a high temperature, extrudes the filament through the nozzle and then lays the filament onto thin layers in order to form a model. When some filaments are heated by the high temperature, the filaments begin to melt and release fine particle-shaped pollutants and volatile organic compounds into the air. E2 and E2CF air filters can effectively filter fine particles and harmful organic volatile substances with stinging smells generated during the 3D printer's work process.Three-stage filter system:The E2 and E2CF air filter has a three-stage filter system which can largely absorb the particles and harmful volatile substances that occur during the printing process. The pre-filter can cause large particles that occur during the printing process, such as Filament residue, collecting; the carbon filter can absorb many odors and smoke that can affect health. The HEPA filter was developed according to certain standards for removing ultra-fine particles f