Hi, how can I export stl files in higher resolution? The dgn files that I export to stl files is not perfect round but instead small lines put together in a circle?

Has anyone be sucsesfull using V8i in creating 3D printable objects and if so how. I seem not to be able to create a object in Microstation, export it with VRML into a printer usable file and print it. It reports manifold error after uploading the…