A small triangular bipyramid and two tetrahedra which can be joined together to form a large triangular bipyramid composed of hexagonal prisms. The large bipyramid is constructed from two parts to avoid printing with support. Holes are provided at the vertices so that the two parts can be joined with pieces of wire or string. The parts can be bound tightly to form a triangular bipyramid or separated to make mobiles. The separate parts can also serve as tetrahedral ornaments.

OpenSCAD code is included.

MakerBot

MakerBot Replicator (5th Generation)

Yes

No

.2 mm

The small bipyramid needs support for printing.

A triangular bipyramid can be constructed by joining two tetrahedra face to face;

• https://en.wikipedia.org/wiki/Triangular_bipyramid - a Johnson solid.
• https://en.wikipedia.org/wiki/Johnson_solid -

The ornaments are made of arrays of hexagonal prisms.

A lattice of vertices related to the structure of graphite was created.

• see graphite lattice model - https://www.thingiverse.com/thing:13672 -
  The intersection of this lattice with a tetrahedron created the prism positions.
  • see Pyramids made from Cubes - https://www.thingiverse.com/thing:3966742