a few years ago i printed a few second runs for some of my earlier posters. i will never do it again. most of the reasons were like you mentioned... running out too early and having people asking about buying a sold out print every other day sucks. especially when the other prints just stack up and collect dust. i numbered them as a whole new set, wrote "second printing" next to the number, and sold them for a lower price. i wouldn't advise doing it, but i still did it. never again.