This is a tetrapod out of sp3-carbon (which itself has tetrahedral symmetry).
The surfaces are passivated mainly with Hydrogen.

Some sorts of productive nanosystems like
nanofactories, molecular-assemblers or something in-between
will be needed to produce/"print" objects like this.

The abbreviation stands for:
-- Diamondoid Molecular Structural Element (DMSE)
which translates to:
-- very stiff and crystalline -- very small -- non active non moving -- building block

This one is meant to be used in bigger frameworks like nano-housings etc.
The strut ends are unsaturated Surface-Interfaces (Sinterface is nice).
The seven open bonds can be put together in two different ways =>
diamond structure, lonsdaleit structure & many more.


You can find more technical informations about
Mechanosynthesis & Molecular Nanotechnology in general in
the book "Nanosystems" written by Eric Drexler.


Titlepicture made with:
QuteMolX, v.0.5.1, Nanorex, Inc., nanorex.com, 2010.
qutemol.sourceforge.net/
Structure generated with:
NanoEngineer-1, Nanorex, Inc., nanorex.com, 2010.

And the paper that presented QuteMol:
Marco Tarini, Paolo Cignoni, Claudio Montani: Ambient Occlusion and Edge Cueing for Enhancing Real Time Molecular Visualization, IEEE Transactions on Visualization and Computer Graphics, Volume 12, Issue 5, Pages 1237-1244, 2006, ISSN: 1077-2626

ps:
Somewhat related to this is one of the simplest possible structurally usable 2D fractals: thingiverse.com/thing:14023 .
Extruded this would form some spongy hexagonal tube structure.