Two printers & two sets of default settings

Hi,

I've got two printers, one printer is A4, and the second one is A3. I've been trying to set things up so that each printer has its respective paper size as default. Each time i change one printers settings, the other one changes too. I've changed the defaults on each printer from the CUPS web interface but it doesn't seem to have worked.

Is there a way i can set up my printers so they each default to different paper sizes?

Any help is most appreciated.