Quarter moon outline with Voronoi pattern inside. It comes in two variants:

• wireframe (moon.stl)
• wireframe + 2 x subdivision surface (moon_sub2.stl)

The inside is slightly raised relative to the outline and that made my first print fail. I lowered the model in the slicer until the inside touched the bed to fix the issue.

Inspired by https://www.thingiverse.com/thing:2215079

Geometry Moons: these are generated with Blender's Geometry Nodes. I have a basic pattern that gets generated every time differently, just changing a numerical seed. So every moon I print is unique.