yeah we're thinking it has something to do with the router changing IPs, How do we fix it so that the computers will pick up on the new IPs?
Good question, one that I don't have a good answer for.
When my Mac kept loosing connections with our network printer I manually added it using the instructions below. It's for a printer wired to a Windows printer though and I don't know if it could be used for a Mac wired printer. It might be a give you an idea in connecting your printer to the Macs, maybe not.
For my current wireless printer (Canon MP980) I used the supplied CD to set up my MBP (OS X 10.5.7) for wireless printing and one of the instructions in my previous post with links to add the printer to my other Mac, a PBG4 (OS X 10.4.11). Both times using a Linksys router, a WRT 54G v6.
Good luck in connecting your printer. Sorry for not being much of a help. Maybe somebody with better knowledge in networking will chime in to help you better.
1. Open Printer Setup Utility (located in /Applications/Utilities).
2. Mac OS X 10.4.x users: Choose Add Printer from the Printers menu, then hold the Option key while clicking the "More Printers" button.
Mac OS X 10.3.x users: Hold the Option key down while choosing Add Printer from the Printers menu.
3. Choose Advanced from the first pop-up menu.
4. Choose Windows Printer via SAMBA from the Device pop-up menu.
5. In the Device Name field, type the name you would like to use for this printer in Mac OS X.
6. In the Device URI field, use one of the following formats to link to the printer:
Notes: "user" is the name of a Windows user who has privileges to use the printer. "password" is the password of that Windows user. "workgroup" is the name of the Windows workgroup to which the computer sharing the printer belongs. "server" is the name of the computer sharing the printer or its IP address. "sharename" is the shared Windows printer's share name.
Tip: You don't need a "workgroup" when specifying the IP address of the computer (such as when the printer is on a different subnet), or if your Mac belongs to the same Windows (SMB) workgroup.
7. Choose the appropriate PPD or printer driver from the Printer Model pop-up menu.
8. Click Add.