__init__.py

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bl_addon_info = {
    "name": "Import/Export: STL format",
    "author": "Guillaume Bouchard (Guillaum)",
    "version": "1",
    "blender": (2, 5, 3),
    "location": "File > Import/Export > Stl",
    "description": "Import/Export Stl files",
    "warning": "",
    "wiki_url": "http://wiki.blender.org/index.php/Extensions:2.5/Py/Scripts/File I-O/STL",
    "tracker_url": "https://projects.blender.org/tracker/index.php?func=detail&aid=22837&group_id=153&atid=469",
    "category": "Import/Export"}

# @todo write the wiki page

"""
Import/Export STL files (binary or ascii)

- Import automatically remove the doubles.
- Export can export with/without modifiers applied

Issues:

Import:
    - Does not handle the normal of the triangles
    - Does not handle endien

Export:
    - Does not do the object space transformation
    - Export only one object (the selected one)
"""

import bpy
from bpy.props import *


try:
    init_data

    reload(stl_utils)
    reload(blender_utils)
except:
    from io_mesh_stl import stl_utils
    from io_mesh_stl import blender_utils

init_data = True


class StlImporter(bpy.types.Operator):
    '''
    Load STL triangle mesh data
    '''
    bl_idname = "import_mesh.stl"
    bl_label = "Import STL"

    filepath = StringProperty(name="File Path",
                          description="File path used for importing "
                                      "the STL file",
                          maxlen=1024,
                          default="")

    def execute(self, context):
        objName = bpy.utils.display_name(self.properties.filepath.split("\\")[-1].split("/")[-1])
        tris, pts = stl_utils.read_stl(self.properties.filepath)

        blender_utils.create_and_link_mesh(objName, tris, pts)

        return {'FINISHED'}

    def invoke(self, context, event):
        wm = context.manager
        wm.add_fileselect(self)

        return {'RUNNING_MODAL'}


class StlExporter(bpy.types.Operator):
    '''
    Save STL triangle mesh data from the active object
    '''
    bl_idname = "export_mesh.stl"
    bl_label = "Export STL"

    filepath = StringProperty(name="File Path",
                          description="File path used for exporting "
                                      "the active object to STL file",
                          maxlen=1024,
                          default="")
    check_existing = BoolProperty(name="Check Existing",
                                  description="Check and warn on "
                                              "overwriting existing files",
                                  default=True,
                                  options={'HIDDEN'})

    ascii = BoolProperty(name="Ascii",
                         description="Save the file in ASCII file format",
                         default=False)
    apply_modifiers = BoolProperty(name="Apply Modifiers",
                                   description="Apply the modifiers "
                                               "before saving",
                                   default=True)

    def execute(self, context):
        ob = context.active_object

        faces = blender_utils.faces_from_mesh(ob,
                                              self.properties.apply_modifiers)
        stl_utils.write_stl(self.properties.filepath, faces, self.properties.ascii)

        return {'FINISHED'}

    def invoke(self, context, event):
        wm = context.manager
        wm.add_fileselect(self)
        return {'RUNNING_MODAL'}


def menu_import(self, context):
    self.layout.operator(StlImporter.bl_idname,
                         text="Stl (.stl)").filepath = "*.stl"


def menu_export(self, context):
    import os
    default_path = os.path.splitext(bpy.data.filepath)[0] + ".stl"
    self.layout.operator(StlExporter.bl_idname,
                         text="Stl (.stl)").filepath = default_path


def register():
    bpy.types.INFO_MT_file_import.append(menu_import)
    bpy.types.INFO_MT_file_export.append(menu_export)


def unregister():
    bpy.types.INFO_MT_file_import.remove(menu_import)
    bpy.types.INFO_MT_file_export.remove(menu_export)


if __name__ == "__main__":
    register()