The OSIRIS-REx probe is currently (as of april 2019) in orbit around asteroid Bennu, a Near-Earth object.
NASA kindly let us get access to a fine 3d model of the asteroid, which can be found here : https://www.asteroidmission.org/updated-bennu-shape-model-3d-files/
I improved the 3d model to get sharper details, so be warned this is indeed a personnal take, but still very close to the real NASA 3d model.
I prepared the models to be printable, and chose to be able to open it afterward. The two halves are maintained pressed with about 9 neodymium magnets (diameter : 10mm, thickness 2mm). The vertebra is then glued on the "A" part.
It's about 120-130 mm (4.2-5.1in) wide.
Painted with Spraypaint form Liquitex, then washed with black oilpaint.
Have fun !
Credit: NASA/Goddard/University of Arizona
eMotion Tech PLA
Use supports ! The magnets holders are designed to never touch each over in order to keep the lips of the two halves in pressure, without any gaps. Hard part is to remove the supports whitch can a bit fused to the real 3d printed part. I used a dremel flapwheel bit to remove the excess material (accessories 502-503-504-505).