.sla Extension - List of programs that can open .sla files Apr 24, 2020 This file type is a set of instructions for the 3D printer (temperature, movements, etc.) generated by a slicing software from a 3D file format (STL, OBJ, AMF, 3MF, and more). STL is the most popular 3D file format. Stereolithography (SLA or SL; also known as stereolithography apparatus, optical fabrication, photo-solidifica..