I'm trying to 3d print a hollowed version of the bust of a video-game character. The character is very detailed and has meshes for every part of armor and a single eye is composed of 4 different meshes. I've seen that in older blender version it was possible by using the fluid simulation like explained in this video, where a multimesh object was "approximated" by its' fluid sim in blender. https://www.youtube.com/watch?v=K-l2XAkZxVg
I've tried to apply the domain fluid mode to the external cube and the fluid -> flow mode to the mesh at no avail. I don't seem to be able to see any change in the original mesh.