I have one customer who has trouble with their printers on the network. Maybe they have finally learned what they need to understand the issue, but I doubt it.
They have two printers. One is plugged into their wifi router, the second printer is not plugged in but offers a wifi link to connect to the printer. If they are connected to the wifi router, they can't print to the second printer. If they are connected to the second printer, then they have no internet access.
The obvious thing to do is to connect the second printer to their LAN but they don't want to do that. In other words, they want it to act like a LAN without having everything connected on the LAN.