How to smooth mesh

Hello, I have a closed mesh that was created using SubD. I would like to 3D print it but it’s quite bumpy when I would like it to be smooth. How can I go about creating a more seamless surface?

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What dou mean by bumpy??

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There are many ridges and grooves so the surface isn’t perfectly smooth, especially toward the ground plane

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Hi -

How did you convert the SubD object to a mesh object?
If you extract the render mesh or first convert to NURBS and then extract the render mesh, the result should be as smooth as the SubD object.
Apart from that, post a 3dm file so that people don’t have to guess as much.