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Where is this setting? Can't find it and all my organic meshes have face edge artifacts, no matter how fine.

Apologies, didn't see this until now.

Click on the Object, Select the "Appearance" tab within the "Object Parameters" box.
For MR 4, just look below on the Appearance Panel to find "Smoothing." The default value is "60.00." Increase this value for more smoothing.
For MR 5, first click in the "ADVANCED" box to open up this panel. Then look down in the Panel for the Smoothing parameter.

I'm confused, where is this? I can't find it in Rhinoceros.

Hello Bathsheba,

In theory, this should be handled by the 3D app, however the plugin for Rhino 5 also offers a smoothing option here:

In the plugin for Rhino 6 it's not implemented yet, but Rhino should be able to handle the smoothing when exporting too, if I'm not wrong.

Best,
Fernando