Hi, I'm looking for a solution to see a 3D pipe or cylinder as a single line. This allow me to draw every thing in 3D for the interdisciplinary coordination, but at the same time to print the drawing in single line.
Do you have any suggestion or tips?

Thank you in advance for your answers.

I'm not sure how you are creating your 3D pipes, but if it were me then needing this I would have a single Centre Line layer with the pipe centre lines on. You can then turn off everything else and just print that layer.
Alternatively, have you tried the 'wireframe' display?