@Maria: It's hard to say really, I'd check what the network settings are on your computer and compare that with the other computers. It shouldn't require sharing the printer via your machine.
Are the other machines Macs? If not and they are Windows machines then you may need to re-setup the printers on those machines (without sharing it from yours), Windows has the downside when configuring printers via IP address like this that if it changes then you need to re-setup the printer.
Hope you manage to get it working!