I have an STL that I split into two pieces with Meshmixer. I will be doing this for dual color printing.

The problem I run into is it makes the part hollow as it removes the face in the process. Is there some way to do this better or fill the hollow part after splitting the STL?

Capture.JPG

This is an example of what I'm seeing. It seems like this should be pretty easy to aoid and/or fix, but I can't figure it out.

Thanks!