Inspired by my first "Inclusions" model, it is in fact very similar to a Sierpinski pyramid (somewhere between level 4 and 5). Instead of being made by removing matter from a solid tetrahedron, it is made by adding edges to a wireframed tetrahedron. Thus is is more 3D print friendly (no small sections supporting weight). Read this post.
This one has its larger edges measuring 6 cm. A larger version is also available.