No. All five devices (2 wired printers, 1 wired G4, and 2 wireless MB Pros) have dynamically assigned IP addresses in a single range from 192.168.1.100 through 149 and have been functioning well without too many "collisions". Now, however, the laptops see the printers, but they always find them "offline".
Turn off Printer Sharing on the G4, reboot it, then on the MBPs...
Resetting the printing system in Mac OS X 10.5.x+++
1. To use the Reset Printing System feature in Mac OS X 10.5.x, follow these steps:
2. Choose System Preferences from the Apple menu.
3. Choose Print & Fax from the View menu.
4. Control-click on list of printers on the left side of the window, then choose "Reset printing system" from the contextual menu. If you don't see a list of printers, Control-click on the text "Click + to add a printer or fax" and select "Reset printing system..." As an alternative, if you currently have one or more printers listed, you can Option-click the "-" (Remove printer) button.
Well, I am halfway there. Following your steps on the Snow Leopard MBP, the newer printer (a Canon MX860 inkjet) appeared automatically under the "default" icon on the ADD printer window. I used the IP icon with the HP Jetdirect-Socket protocol to find and add the older printer, (an HP 4000N). That required running a configuration page from the printer to locate its IP address. I printed to both printers through this laptop with success!
I then followed exactly the same procedure with the Mountain Lion MBP. For both installation attempts, I got an error message window: Unable to verify the printer on your network. "192.168.111" may not exist or is unavailable at this time. Would you still like to create the printer? If I click Continue, it creates the icon and name in the printer list. However when I attempt to print from an app. the next message says, 'Printer is unavailable.'
Why one laptop finds and uses both printers, and the newer laptop does not, just floors me!
Thank you for your ongoing assistance.
This seems to be a problem with network topology which I know enough to be dangerous.
All devices must be connected to the same wifi router.
Of course, you can buy office routers and configure them to route printer data around the network. This is more expensive and take time and knowledge.
Do you have more than one router?