Hexiamonds
I made 3D models for Hexiamond puzzle pieces, which can be downloaded here (STL format).
Each Hexiamond piece consists of 6 triangles, which yields 12 different pieces when you try out all combinations.
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