I am trying to set duplex as the default for my printer. Many people have told me to just create a preset and use that but there are some apps that this doesn't work for, so I am looking for a different solution. Another option I have found is to modify the CUPS settings on my mac for the printer. If I go into CUPS page for my printer, I change the two sided setting to on with long edge binding to be the default. This gives me an error though and wants me to change the default paper size to "A4 two sided margins". So I do that. Now whenever I go to print something, I get an error message come up:
"Changing the destination paper to A4 would cause a conflict that cannot be resolved. No change will be made."
The only thing I think could be causing this is that the default paper size setting in the printers section of system preferences is set to A4. There is no A4 Two sided margins option to select there. Maybe something else is causing the error.
Any suggestions on how I could fix this?
Running Mac 10.9.4 and HP Photosmart 5520.