This is a model of the human body with a wire or bone or lattice structure that I made. It is watertight and one piece mesh. You can try to 3d-print it if you want (I don’t tried it)

Previews rendered with Cycles engine, but you can use Eevee render too.

I added two types of export files (OBJ and FBX): level1 (less polygons) and level2 (more polygons). In blender scene I used level2 mesh.

Hope you like it!