"Regular Polyhedral Compounds" Tree Ornaments

Tree ornaments made from the [Regular Polyhedral Compounds](https://en.wikipedia.org/wiki/Polytope_compound#Regular_compounds)

These are:

* [Compound of Five Cubes](https://en.wikipedia.org/wiki/Compound_of_five_cubes)
* [Compound of Two Tetrahedra](https://en.wikipedia.org/wiki/Stellated_octahedron)
* [Compound of Five Tetrahedra](https://en.wikipedia.org/wiki/Compound_of_five_tetrahedra)
* [Compound of Ten Tetrahedra](https://en.wikipedia.org/wiki/Compound_of_ten_tetrahedra)
* [Compound of Five Octahedra](https://en.wikipedia.org/wiki/Compound_of_five_octahedra)

These are provided as whole models, as well as split horizontally with a joining cube, to allow printing them with minimal overhangs.

The "Compound of Five Cubes" is also provided as a "clipped" model, where one of the sides has been truncated.
The ornament has been arranged with this face to the bottom, so it can be printed in a single piece.
None of the other ornaments have a orientation that lends itself to printing i