The original model was too big for my printer so I made the STL hollow and cut it into 9 pieces (Einstein Bust Pieces.zip).
After printing I glued parts 1 to 4 together and 5 to 9. I put some letters on the parts that match but it is hardly a puzzle so forget them.
I used acetone to smooth the 2 parts and filled them with gypsum plaster so the bust weighs more like a real statue.
After gluing everything together and some sanding and priming (a lot) I coated the model with copper, gold silver and flat black to get a bronze look.