AttributeError: Calling operator "bpy.ops.export_scene.obj" error, could not be found
最近のBlenderでは export_sceneが削除されているようだ。
https://github.com/jayanam/jremesh-tools/issues/7
# Export original object
bpy.ops.export_scene.obj(filepath=orig,
                            use_selection=True,
                            use_mesh_modifiers=True,
                            use_edges=True,
                            use_smooth_groups=False,
                            use_smooth_groups_bitflags=False,
                            use_normals=True,
                            use_uvs=True)
を以下に変更
# Export original object
bpy.ops.wm.obj_export(filepath=orig,
                            check_existing=False,
                            export_selected_objects=True,
                            apply_modifiers=True,
                            export_smooth_groups=False,
                            smooth_group_bitflags=False,
                            export_normals=True,
                            export_uv=True)