7-tier Sierpinski Tetrahedron

I saw a tier-6 Sierpinski pyramid on here a while back, and thought I should 1-up them. So here - a regular, 7-tier Sierpinski tetrahedron. As I don't want to have a 2-minute backlog of lag on my PC, I'm leaving the height of the pyramid at 1.5m, but that can be modified if you're patient. Or hey, if you have a printer that big, go for it!