In non-invasive mechanical ventilation (NIMV), the interface is the primary determinant of success, as adherence and quality of therapy mainly depend on it. The aim of this study is to investigate the usefulness of a customised mask approach to minimise leakage and upper airway obstruction. It will focus on ventilator registries and changes in the way they can be corrected with these customised masks. The process involves 3D face scanning and dedicated computer-aided design. The processing and manufacturing of the masks is based on additive manufacturing through 3D printing.