Read the story and see photos from the NASA Eclipse Ballooning Workshop.
NASA has a resource page (Beta) of 3D printing models available. Along with models of spacecraft and asteroids, there are some topographical maps of planetary features.
At MCC’s Fab Lab, I was able to have a model of the Gale Crater on Mars printed.
I wanted it printed in white so I could try to paint it to look more realistic.
I used plain acrylic paints and it worked better than I anticipated.