I have been struggling with an organic model with some square openings for many hours, first because I had trouble making it solid, then when that worked i realized that it's too low poly to get a good 3D print result. Then I spend a lot of time trying to smooth/upscale the geometry but I haven't been successful. I tried with an up sampling plugin in Sketchup which didn't work. I have tried in 3DsMax too with tessellation.
I have been told that it might be possible in meshlab, but does anyone here know how to 'smooth' a model while keeping the sharp features?