Creo Parametric 3.0 Printing Problem

Best I can tell is that you either want "dimmed" tangents - which will probably be too much for your liking. It may be possible to show edges manually.

Try Edge Display.  You will have to select every line you want to remove.  This tool will also allow you to change line styles and show hidden lines.

Often, when edges are not behaving as expected, the cause is that two or more parts are interfering with each other. If one part is embedded, even slightly, in another part, the software has a difficult time deciding which lines should be shown in a hidden line removed view, and often chooses poorly. Sometime it can be made a bit better by changing the viewing angle slightly, but the only way to ensure things work properly is to fix things to remove the interference(s).

Another common source of trouble is if the model being used in the assembly is not an actual solid model, but composed of surfaces. This happens a lot when complicated models, like electric motors, actuators, etc. are downloaded from suppliers.