Translations:Export to STL or OBJ/5/en

From FreeCAD Documentation
  1. Switch to the Mesh Workbench.
  2. Select the solid to be meshed in the tree view.
  3. Choose Meshes → Create Mesh from shape... from the main (top) menu.
  4. Select one of the available meshers and specify the available options. For more information refer to Mesh from Shape.
  5. Choose OK. The mesh object will be created in the tree view (with a green mesh icon ).
  6. Right click the mesh object in the tree view and choose Export mesh....
  7. Fill in the file name, the extension is not necessary. The extension will be set based on the file type. If you include an extension which does not match the selected file type, an extension for the selected type will be added when the file is saved.
  8. The default file type is Binary STL (*.stl). Change the type if you wish.
  9. Choose Save.