Boolean Union Doesn't Work All I'm looking to do is union join two meshes together. They're not overly large or complex and I can't find any faults with them (Mind you I'm new to this). If anyone can help I'd be very grateful! It shouldn't take long at all for anyone with experience.
The file is linked here.
The inner mesh Ear Deco has overlapping faces.


Go into edit mode Tab. Select B and hide H the outermost faces. You will find additional faces inside the mesh.

Go into face selection mode Ctrl + Tab > F, select the unnecessary internal faces and delete them X.

The boolean modifier will now work.