Good article in the Visual Artists Ireland news sheet by designer / maker Kate Oram on the process she has developed to bronze cast 3D printed objects. The concept was developed during phase one of the Harnessing Creativity program last year (2013) which Leo facilitates on. Check out her web site at www.kateoram.com 
You can also check out the Harnessing Creativity web site for more information on the current batch of participants in phase two. www.harnessingcreativity.eu