absolute beginner here,
I'm trying to get a 3D printable .obj or .stl file by using a displacement modifier from a greyscale heightmap on a simple plane in blender.
In order to be printable, the plane needs to be closed at the bottom, which I can't manage to do and tutorials for the solidify modifier didn't seem to help.
Thank you for your help!
This is what happens when I try to extrude the plane: