I had trouble exporting this, so you will need to rotate it logically to print it. This does print WITHOUT supports.

This is a marble track in the general shape of CERN, better known as the Large Hadron Collider. I have no clue why I made this; it ended up being super complex and took me about 5-10 hours, compared to most of my .5-1 hour designs. Anyway, this is the result and I think it seems pretty cool.