The lunar crater Plato is especially interesting for amateur astronomers because its dark, smooth floor and steep walls are easy to observe even with small telescopes. About 1–2 days after First Quarter, when the Sun is low over the crater floor, tiny craterlets inside Plato become visible, and their detectability is often used as a test of a telescope’s optical quality and resolution.

source for the geographic data is NASA 

original size  stl is 400x400mm you can resize as you want in your slicer ;) 

would recommend scaling to about 50%