Covid 19 Mask with Exhale Valve Free 3D print model

3D PRINTING SETTINGSNo supportNo Horizontal Expansion (set it to 0 zero) for all partsPrint 0.5 line width for all partsFill between walls : nowherePRINT THE EXHALE HOLE SEAL WITH TPU/FLEX FILAMENT 15 mm/s speed no retraction, no coolingPrint 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.