Integrate 3D printing features/tests

[VictorLamoine]

Paul Hvass quote:

The most significant change, I believe, relates to our use case in additive manufacturing. Your current method dilates the surface to create a normal mesh, but then rasters/cuts on a flat even pitch along a user-defined axis. We desire to define the cutting surface (mesh) and then raster at a constant arc-distance away from that surface (refer to the attached pic). It is basically like dilating along the surface to create the raster paths. This need arises in order to deposit (3D print) a constant rate of material as the tool travels along the path.

• [ ] Modify existing features and/or add "specific" 3D printing modes.
• [ ] Add a use case (ideally provided by SwRI) to test the features.
• [ ] Document everything (Doxygen + MarkDown tutorial).
• [ ] Change the project description; it's not limited to grinding.

[phvass]

+1