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a ISINNOVA’s Charlotte valve [51] made by different processes and materials—from left to right: MJF/PA12, FDM/PC and SLS/PA12. b Venturi valve models by SLS/PA12 and PolyJet/VeroClear®. c Snorkeling mask connected to an ISINNOVA’s valve for being used during CPAP procedure. d Diverse types of valves: 1—Charlotte [51]; 2—Dave [51]; 3,4,5—Modified Charlottes; 6–adaptors made by SLS/PA12
