Get 3D output of Volume rendering

How can i save volume rendering output in stl or obj format?

Please refer to these past topics:
https://discourse.slicer.org/t/save-volume-rendering-as-stl-file/524
https://discourse.slicer.org/t/volume-rendering-to-obj-or-stl-format/1512
https://discourse.slicer.org/t/how-to-export-the-volume-rendering-into-models/1019/3