Well, I think that's the easy part. When you edit a component, there's a dialog box entry that you can specify the name of the 3D file. That I can do.
The problem is how to create a new component in the first place. Do you start by editing an existing component and then give the modified version a new name somehow? And how does it get added to the user components library. That would be good enough for now. It doesn't seem immediately obvious to me.
