Clipping Plane Profile Lines Won't Print

I’ve been having this problem for a while and I hope someone can help. I have a series of closed polysurfaces and open surfaces with a clipping plane cutting through them. In the viewport preview there is a nice thick line at each geometry where it intersects the clipping plane. When I print this view to a PDF or an image file most, if not all, of the thick lines are gone with nothing left in their place. Please help, it’s making me crazy!