I would say it will be a combination of settings.
So it appears he is having issues where "poles" are created for the stl mesh.
Poles are not necessarily bad and don't specifically make something "not smooth", but they can create effects when combined with the other settings that have to do with generating a path for the printer.
Although you have a high resolution printer, there will be settings that determine the print resolution. Various step/size settings for the print. Nozzle stuff etc.....
These combined with the sizes/counts of the polygons will affect the end result.
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