Is it possible to remove the internal intersections of mesh that have been added together in edit mode to create one 'object' - ideally creating a smooth interior, e.g. for 3D printing?
I have tried booleans but they are so destructive I'm really hoping for another fix..
This is what I have right now:
And this is what I would like it to remain looking like this on the outside:
What I would like it to look like on the inside is a replica of the outside, with all the redundant mesh removed - like the inside of a toy or a clay model that has been hollowed out.
Booleans are just not working, they absolutely destroy the mesh whenever I try to use them.
Literally dying trying to figure this out, so any help would be immensely appreciated.
The key issue is that it's for optimising a model for 3D printing, AS WELL AS keeping it smooth on the outside (and non-manifold)
Thanks!!

