This model is a modified version of LAFACTORIA3D s v2 design.

I elongated the mask to provide more space for your mouth and chin.

Reduced the seperate print parts, combined the filter connector to the body.

Use window/door rubber seal tape for the mask edges.

3D PRINTING SETTINGS
No support
No Horizontal Expansion (set it to 0 zero) for all parts
Print 0.5 line width for all parts
Fill between walls : nowhere
PRINT THE EXHALE HOLE SEAL WITH TPU/FLEX FILAMENT 15 mm/s speed no retraction, no cooling
Print exhale hole ring and the seal without raft, let them stick directly to the print bed to achive smooth polished surface, then you need to face that polished faces together while montage process. So you can get air tight sealant.