link to file: https://nasa3d.arc.nasa.gov/detail/lmmp-tycho
I recently discovered that NASA has a repository of lots of 3D models and files available to download. As I sorted through them I discovered the Tycho crater (the big circle on the lower 1/4 of the moon in the image below.
Tycho is around 86km across, and my print is just around 80mm across; giving this a scale of around 1,000,000:1. The print is a topographic model of the the crater, with ridges rising and falling, and the "island" in the center. The peak is 1.6km in real life, and around 1.5mm in print. The whole tile is 98mm squared (3.8")
putting harsh, bright light on an edge helps create and define the shadows of the surface
a low steep angle overlooking the crater's rim
high, vertical angle to see the crater floor detail