To export STL 3D models for AR, open your model in 3D software (e.g., Blender, SolidWorks), optimize it for AR (reduce polygons, fix non-watertight geometry), then use the software’s "Export" function to save as STL.
STL files store mesh data—AR apps need lightweight, error-free meshes to load quickly and render correctly, so optimization is critical.
After exporting, test the STL in an AR tool (like Unity with AR Foundation) or use a free checker (e.g., MeshLab) to ensure it’s AR-ready.