for my P&IDs I often use small circles for junctions. They are handy because you can align them to the shapes supposed to be in the same row or column and the connectors don't behave weird.
These points need to be small enough to be "nice", but then they get too small to be selected and moved properly without scaling.
Thus I group them with some bigger lines that I put on the guides layer, hoping that they won't be printed.
Publishing is done by printing the PI&Ds as PDFs ... and the guide lines, whilst set on no printing, are there - ugly!
How do you guys out there handle this problem?
You will probably tell me to configure properly my PDF printer... the question is how? I'm using adobe professional.