Blender's tools for checking models
===================================

Blender has many available **Add-ons** or plugins. By default, not all are
pre-loaded. One of these is the 3D Print Toolbox, which we have to enable.

We also have the `Mesh Analysis` panel, in the Properties Shelf, which has
a subset of the 3D Print Toolbox features:

.. figure:: /images/mesh-analysis.png

    The Mesh Analysis panel, in the Properties Shelf. Must be in Edit Mode.

.. admonition:: Exercise: enabling the 3D Print Toolbox.

    * :menuselection:`File --> User Preferences` (or :kbd:`Ctrl-Alt-U`) to open the
      User Preferences menu.

    * In the :menuselection:`Add-ons` tab, start typing `3d print` into the search
      bar. Once the "Mesh: 3D Print Toolbox" shows up, click the checkbox on the far
      right to enable this add-on.

    .. figure:: /images/user_preferences_3dprint.png
        :width: 75%

        :menuselection:`File --> User Preferences --> "Add-ons" Tab`. Check the box
        on the far right to enable

    * Close the User Preferences window.

    * In the Tool Shelf, there should be a new `3D Printing` tab.

    .. figure:: /images/3dprint-toolbox.png

        The newly available 3D Printing toolbox