This model is made by myself using MATLAB R2016a and Paint.net on the topography map from the blog of Dr. Paul Schenk. The original map has the knowed topography only, the rest of the Saturn's moon surface topography is unknown because of the low resolution of the images. It's scaled to 1 in 107 or one in ten million. This is a 15cm model. On this scale the Moon is a basketball, and Mars' moons Phobos and Deimos are 2 and 1 mm respectively.
The file's names explained: name_1_x_10_y.stl is 1 : x * 10y. So _1_6_10_7 is 1:600000000 or one in 60 million.
Schenk, P. (2010) New Moons – First Global Topographic Maps of (Saturn's) Icy Moons, http://stereomoons.blogspot.com/2010/11/new-moons.html
Iapetus is the 24th moon closer to Saturn and its third biggest in size and mass. Although the second largest Saturn's moon, Rhea, is slightly larger, Iapetus is considered not being in hydrostatic equilibrium, unlike Rhea. This is because the high variability of the terrain, including large craters, basins and the large equatorial ridge. Another well known unusual feature is the dramatic change of coloration, like chocolate and cream. When Giovanni Cassini discover Iapetus, he could not find it at the east side of Saturn. He correctly deduced that one side of Iapetus was brigther than the other, and it is tidal locked with Saturn.
Orbital period: 79.3215 d.
Composition: Icy body.
Density: 1.088 g/cm3.
Dimensions: 1,492.0 km × 1,492.0 km × 1,424 km
Model scale: 1:1x107 (15cm)
Topographical map from Dr. Paul Schenk blog
Iapetus with it two different colorations and its notable surface feature like the equatorial ridge. By NASA