.stl
STL modelStereolithography
A mesh format created by 3D Systems in 1987 for stereolithography printers. It describes a surface only as triangles, with no colour, units or materials, in text or binary form.
Sending models to 3D printers and slicers.
Opens in Cura, PrusaSlicer, Bambu Studio, Blender, Quick Look on Mac
About STL files.obj
OBJ modelWavefront OBJ
A plain-text geometry format from Wavefront Technologies, dating from the 1980s. It lists vertices, texture coordinates, normals and faces; materials live in a companion .mtl file.
Moving static meshes between almost any 3D programs.
Opens in Blender, Maya, Cinema 4D, Windows 3D Viewer, Quick Look on Mac
About OBJ files