Hi Dave , I have just got back to mine and had it printing today with good results, I'm using the full length supplied tube - my feeling is that it is better to allow free movement and no kinking than to have a short as posible tube.
Have you resized (drilled out) the tube at the ends where it screws into the brass ends as it tightens down the tube bore in this area and would restrict onto the fialment. (obviously make sure all the swarf is removed if you drill it...)
What are the symptoms that make you think it is the tube length causing problems?
Tom
