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I have printers that have been installed & work perfectly, but now none of the printers have "vanished" . I have had this problem before - I know there is a solution but I can not remember it.
Mac mini, macOS 10.14
Could be a problem with your network, e.g. several gateways on the same network confusing bonjour. Try giving the printers a static IP based on their MAC address via your router and setup new printers using those IPs.
Hello,
Please follow the directions on this 3rd party website for assistance resetting the Macintosh printing system.
Vanishing printers on 2012 Mac mini
