In this model I tried to apply subdivision to create a smoother topology for 3D print, but in the back something happens and even when I put the mean crease to 1, it doesn’t do a lot for the back (front looks a bit better). Also the front flat parts (ngon) I would like to smoothen/subdivide for 3D print, but doesn’t seem to work so far with the options I tried Subdivide, grid fill (no equal vertexes) or triangulate faces (weird shapes). Any suggestions?
Also my model appears black when I want to sculpt and on the internet people say this could be a face invert problem, but the alt M option doesn’t seem to work. Any ideas what caused this and how to solve it?