I have always had this issue, basically when i draw a nurbs curve or a circle, i see it perfectly rounded, but once i cut this curve into a solid object, the cut results as a "segmented" curve.
To explain better: If i make a circle of 30mm of diameter, when i cut it into a solid cube, the hole will not be perfectly rounded but seems like a polygon with lots of sides, this results in a smaller diameter (like 29.5) due to all the segments. When i 3D print holes, the diameter is always smaller and the effect is ugly because the surface is not smooth but full of little "faces"
 (cm) - Altair Inspire Studio 2022.1.1 _ 29_11_2023 14_42_09.png)
 (cm) - Altair Inspire Studio 2022.1.1 _ 29_11_2023 14_42_38.png)
As you can see the surface is not smooth but "edgy" and the circle becomes a polygon.
