Free site lets you download and 3-D print your own fossils. Duke Today, Feb. 17, 2016. Duke assistant professor Doug Boyer’s office is more than 8,000 miles away from the vault at the University of Witwatersrand in Johannesburg, South Africa, where the fossil remains of a newly discovered human ancestor, Homo naledi, rest under lock and key. But with a few clicks of his computer’s mouse, he can have models of any one of hundreds of Homo naledi bone fragments delivered to his desk in a matter of minutes, thanks to a free online database of digital fossil scans that anyone can download and print in 3-D. Picked up by Discovery, the Raleigh News & Observer, Science News, CBS news and CBS North Carolina.