I just discovered an issue with the OnShape import resolution. When I import the CAD from OnShape, it looks like this:
Notice the rough shape of the drawing. It looks faceted.
If I download the OnShape drawing in STEP format and import the file, the result is the same. However, if I download the drawing in STL fine format and upload it into SimScale, the result is a much finer drawing (see below). Why is the resolution of the direct import from OnShape so poor?