This page: http://echo.jpl.nasa.gov/links.html links to a bunch of asteroid models in OBJ format, constructed from Earth-based observations made at Arecibo. They're a screen or two down, search for "3-D". I put Kleopatra and Toutatis in my shop (free for download too). I can't guarantee that the rest of them are printable, but I can report that I didn't have any trouble with those two. Anyway, there you go: American tax dollars at work!