Terrestrial laser scanning (TLS) is increasingly used in geomorphology for the study of medium- to small scale landforms. A light weight, compact and portable TLS device has been used in the Grotta A Cave (Mt. Lessini, N Italy) to make a detailed 3D model of the underground environment. A total of 16 scans were used to survey the about 150m long cave in <6h. The 3D model of the cave walls makes it possible to carry out morphometric measurements on the different cave environments. The TLS data allowed us to calculate cave volumes and distinguish cupola, phreatic conduit and basalt dike volumes. Wall roughness analysis also allowed recognising smaller-scale morphologies such as megascallops, differential corrosion forms and mineral crusts. These observations have enabled us to discern between different karstification processes and speleogenetic phases, highlighting the importance of condensation-corrosion on the cave passage enlargement in a quantitative way. Display omitted •Terrestrial laser scanning has been used to survey morphologies in a cave.•TLS data have been used to make volumetric calculations of cave voids.•TLS point clouds allow to distinguish cave wall macro- and micromorphologies.•Different cave morphologies are related to successive speleogenetic stages.•Condensation-corrosion processes are very important in shaping the cave voids.