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.