Of course we wouldn't have to ask (and you wouldn't have to answer) ANY of these questions if you had provided a circuit diagram.
Huh? What does "i don't know if massive printing is heavy" mean here? I have no clue what you are talking about. Take a deep breath and describe what you are trying to do. If you start at the beginning, maybe we can follow along.
That is probably an issue with your software. So far, you have shown us no software and no hardware diagrams, so we're pretty much shooting in the dark here. Hope its fun for you.
There was a thread about almost this exact problem (218 inputs) the other day.
digital loop 2856