Any ideas:

I have an STL file from Thingiverse that needs to be edited. There is plenty of software to convert STL to solids, however, MOI is the preferred software. Does MOI require an STL file converted to another format before importing into MOI? Is there an easy method to edit a file and avoid reconstruction of the file point by point?
The STL file is for 3D printed parts.

Tgoy (Tim)