Jagged STL file

Hi there,

When ever I want to export a selected rhino object in rhino, my object comes out very jagged with many holes inside the solid block. No matter what I do, the object will come out the same despite clealry being smooth? Is there anything i am doing wrong?

To clarify, these are solid objects and i export them as Binary with triangles being 0.5mm. The blocks are roughthly 400mm


I think this is a far from origin problem.

Can you move the objects to 0,0,0 as a test and try exporting again?