Copper infused PLA that is. The small roof was 3D printed using copper infused PLA. I have been able to chemically patina some pieces, but have not yet figured out polishing odd shapes. I have made some roof ridge cap, and various tubs and chimney caps. All can be seen at this link https://1.bp.blogspot.com/-Yx5AYaE21oQ/VzkU1AZ0IWI/AAAAAAAAEjE/4TjqCtT7R-IauA6zV7YjvYh1san6IwKgACKgB/s640/1005.JPG
I will post some of the weathered copper pictures later this week when I get time.
Kent in KC'nvrr49.blogspot.com