code: def principal_inertia_components(self):
          
          # both components and vectors from inertia matrix
          components, vectors = inertia.principal_axis(self.moment_inertia)
          # store vectors in cache for later
          self._cache['principal_inertia_vectors'] = vectors
  
          return components
docs: Return the principal components of inertia
  
          Ordering corresponds to mesh.principal_inertia_vectors
  
          Returns
          ----------
          components : (3,) float
            Principal components of inertia