.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.gltf
glTF modelGL Transmission Format
An open 3D format from the Khronos Group, first released in 2015. A JSON file describes the scene and points to separate binary buffers and texture images.
Exchanging real-time 3D scenes with materials and animation between tools and engines.
Opens in Blender, three.js, Godot, Unity and Unreal (with plug-ins)
About GLTF files