Network printer - no network

Question

I have a network only MFP printer (No Parallel, serial, or USB connection, just network plug (RJ45 I think). It used to be aon a windows 2003 network and worked great. My environment is now changed. I access the internet through a network router but am not a member of that network. I want to be able to use this printer with my PC, but am at a loss as to how to create a network environment where this is possible. any ideas as to what I can do. - Thanks