Save as -> stl.
Deviation: Set the bar to middle
Save all components to single stl. file -> Is easier than Cura project planner
If the file is still not smooth, lower the angle and set the deviation to a lower value
I don't know about solidworks specifically, but remember that stl files are composed of lots of flat (usually) triangular surfaces. So all modeling packages have to do some degree of approximation when exporting curved surfaces, in order to convert a continuous curved surface into lots of tiny triangles that appear to form a continuous surface when seen from far enough away.
Usually you can adjust the resolution of the mesh that is output and/or the amount of deviation from the 'ideal' curve that you will allow. I think that finding and adjusting those settings during the STL output step will help to solve your problem, but I don't know the specific steps you need.
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