Produce STL geometry from an OBJ asset
An OBJ-to-STL pipeline reads the supported polygonal geometry, prepares triangles where required and writes a geometry-only STL result. The route is useful when a mesh asset must enter a tool that accepts STL, including some printing and manufacturing preparation systems.
Mesh conversion does not require reconstruction of a CAD solid. The relevant work is to preserve the intended surface, coordinate scale and object placements while preparing the representation needed by the STL writer.
Decide which objects belong in the output
An OBJ asset may contain multiple groups or objects. Determine whether the receiver needs one combined mesh or separate STL files. Compare the resulting bounds and positions so that combining items does not lose their spatial relationship.
Materials, texture coordinates and other appearance information do not become a portable part of the STL output. If appearance is required, use a scene-format destination instead, such as OBJ to glTF.
Prepare for the receiving process
A successful file write does not establish printability. Check open boundaries, self-intersections, normals and disconnected shells against the receiver’s needs. Surface Wrapping can construct a closed envelope around imperfect tessellation when changing the surface in that way is acceptable.
Write the chosen coordinate scale and communicate it to the receiving workflow. Reopen the output and compare geometry after preparation. Preserve the OBJ and any associated resources if later use requires the original grouping or appearance.