I made 3D models for Hexiamond puzzle pieces, which can be [downloaded here](https://www.unix-ag.uni-kl.de/~guenther/downloads/hexiamonds.tar.gz) (STL format).

Each Hexiamond piece consists of 6 triangles, which yields 12
different pieces when you try out all combinations.

![](/images/hexiamond.png)
3d model of a Hexiamond

More background information and some interesting puzzles to try can be
found on this nice page by David Goodger:
http://puzzler.sourceforge.net/docs/hexiamonds.html