I am trying to export an .STL I can actually 3D print with Blender. I have run through all the tutorials, but my model won't print correctly. I believe the problem would be solved if I could just select the outer shell of the model.
I want to extract everything that is outside (the shell) and delete the inner core. After that I would like to close holes and simplify the model to print. How can I achieve this? Thank you for your help.