Hi there,
I have been trying different ways of hollowing out a model I created for a toy for 3 days now and I’m not having any good luck. 
I’m sorta new to ZBrush, but I didn’t have these problems on my last model.
First of all I was having trouble hollowing it out in general. I imported a model that had been already combined in Maya. The Eyes, face and Hair were all combined. (I tried to boolean them in maya, but of course that didn’t work. (Maya’s boolean is weird and sensitive.) Then I tried to hollow it in Zbrush by remeshing, but I ended up with weird results on the inside. A lot of extra mesh pieces sticking out from the inside because I think it must have recognized the hair and eyes and decided to leave the inside pieces there. So there’s that problem.
My other problem is that it had already been textured. I tried to Remesh my model and project the texture back on, but the projection created extra polys sticking out by the edge of the ears and eyes, or any edge in general.
I finally got to a point where the head is clean and the texture is good (acceptable, although I’m not completely happy). So i have an idea to take my head back into maya and duplicate the clean head, shrink it a little bit to create the “hollow inside” for 3D printing, but I don’t know what is going to happen to the texture because it no longer has UV’s. -sigh-
Does anyone have any good suggestions?
Next time I’m texturing last. blah. somehow I thought it would be a little more seamless to take textures and uv maps from maya to zbrush. hmmm… all a new process for me… much learning to do.
Again any good advice or suggestions are MUCH APPRECIATED.