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Export nurbs object (terrain) to stl


New member

I have made a terrain 3d model in Rhino. The model should be fine, no bad geometry, no open polylines, no naked egdes or non-manifold. I then select it all and try to turn the nurbs to a mesh but i only get a square. I have tried tuning on the advance settings but it doesnt seem to make any difference.

Please help me, the file is to be 3D printed as a landscape model for my master thesis, and it is driving me insane, let alone takes up too much of my time :(


the file is this (amongst several) View attachment A.zip