Generate a 3d model/point cloud from CT scan of abdomen

I want to know step-by-step process on how to convert and download a segmented CT scan model (visible in Slicer) into Point Cloud/STL format. I am a beginner in 3D slicing. Any help is highly appreciated.

That’s done through segmentation. Please read the Segmentation and Segment Editor sections of the Slicer user manual at