Hello, I used Splines and extrude to make a D shape. Although it looks smooth in Solidworks, the resulting 3D print does not. I can see a series of rectangular segments making up the curved surface. This shows up when I viewed the STL file using a viewer. How to create smooth surfaces so that they not only look smooth in Solidworks but also look smooth when printed using a 3D printer? Is there a setting to create smooth curve surfaces in STL format?