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#11
You go into the Printer and set it to be shared across the network, which you can also do through Advanced Sharing in Network. Really you need one machine that no one will use, that could act as file and printer sharing. Someone always has a spare machine lying around that is not doing anything. I have two of them in my Basement that are Intel Core 2 Duo's that still work, just ended up with them in trade of setting up new machines that replaced them. You can also get ahold of the Pi Foundation and they can help walk you through making your setup work better and also show you how to integrate the Pi into being a file server.