This seems a great Idea, but I have a question, (as always, lol). It seems that only one printer can be selected, so how do you cover things like a spark plug and a full car assembly, print out? I am using a HP450C 24" paper roll printer, which will print A1, and A2, from this roll. Something like the sparkplug, will only need an A4 sheet and is a bit of a waste on A2 Size. Have I missed something??