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I would use one of these (or similar) on each USB Printer to take the role of being a Print Server away from the PC's. X-MEDIA XM-PS110U 1-Port 10/100Mbps Fast Ethernet USB Print Server | USB 2.0 Port Network Print Server | Amazon Configure them properly using the instructions. Assign a Static IP Address to each Print Server on the network. The PC's won't need to be powered on if you need to print something from another device. Use a Print Server with one single USB Port for each printer on a network. Each Printer should have its own dedicated Print Server. Avoid using a Print Server that can accept more than one printer. If for any reason the print server fails or glitches, all the printers will be offline. Avoid wireless Print Servers as wireless devices may be an attack vector for hackers who are close by using wireless technology.