--export-stl

When --export-stl is passed, the CLI exports the loaded model geometry to binary STL files without slicing. It is a boolean switch that takes no argument. Before writing, the engine ensures that any object without a placed instance receives a default identity-transform instance, so no objects are silently skipped.

Despite the tooltip's wording, the flag does not produce a single file for the entire project. It produces one .stl file per loaded object. Within each file, the geometry is a true merge: all non-modifier volumes of the object are unioned into one raw mesh, every instance of that object is then transformed and merged into that mesh, and the result is written as a single contiguous binary STL. An object that has been duplicated three times on the build plate therefore produces one STL file containing all three copies laid out at their placed positions.

Output files are named obj_<N>_<objectname>.stl (N is a 1-based counter) and are placed in a stl/ subdirectory. If --outputdir is set, the stl/ directory is created under it; otherwise it is created in the current working directory. The subdirectory is made automatically if it does not already exist. The flag is also the implied fallback action after --cut: if a cut operation completes and no other action was requested, the CLI automatically adds the STL export step, so the cut pieces are emitted as STL without a separate flag.