Hi Claus, MoI does not yet have any function in it for assigning line weights to different individual objects. That's something that you need to do in a 2D vector drawing program like Adobe Illustrator, Affinity Designer, Xara, Corel Draw, Inkscape, etc...

I do want to add more 2D vector-like controls in MoI but it's something that's happening slowly over time - the primary focus in MoI is on 3D model construction and it does not yet incorporate all the same functionality you would find in a 2D vector drawing program. It's assumed that if you need that type of functionality you can get it already by opening your PDF file in one of those programs, that's why it hasn't been a big priority yet.

You can control the line weight that's used for different visible/hidden/silhouette categories of lines in hidden-line PDF export by clicking the "Line style options" button as shown here:


Then the "Width" column has controls for what widths will be used in the generated 2D drawing:


That will only be applicable though if you are exporting solids to PDF or AI format, that's when a 2D hidden line drawing will be generated. If you export only curves that will be a wireframe export instead of a hidden line drawing export and they will just all get line weights of 1.

As you've seen mentioned there is also another line width setting in the moi.ini file, under [View] LineWidth=1.0 - that controls the line width used for all curves drawn in MoI's viewports, it will only affect the on screen display and has no impact on exports.

Hope this helps!

- Michael