First I wish you Michael and to other moi3d users Happy,productive and creative New Year 2018.

Now my question.I uploaded some 3d models designed and created with Moi3d V3 version on my mini factory website.People like my 3d models,but there is sometimes problem with inverted normals when I export it to STL with moi3d.Thank you in advance for your advice and for your help.Should I use other software to fix that problem or something else to do.

Here is one of message from my mini factory member
<Hi. Message to the creator of the design. Can you separate wheels from the main body and check for the STLs to be manifold? As it is now is not printable. In meshmixer it looks like the STL file is kind of inverted>