Hi OSTexo, so right now there isn't any way in MoI to have some curves displayed thicker than others. In the regular PDF/AI export the outlines and silhouette types of output have greater thickness assigned to them to get their appropriate visual effect but directly inside MoI right now that wouldn't be able to happen and they'd just be stacked up right on top of regular visual lines. So that's why the Make2D command that generates the hidden line drawing and keeps it inside MoI does not have any option for generating those right now. That could change in the future at some point when MoI is able to have display thickness for different curves though.

- Michael