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I would like to 3d print a topographic map of the world. I’m starting from the following grayscale PNG.

enter image description here

I have previously played with Blender to render this shape using a grid mesh and the displace modifier. However just exporting the resulting mesh to obj/stl hasn’t worked with my slicing software.

I suspect the main problem is that the grid isn’t “filled” underneath -- how would I go about fixing that?

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