When you say ethernet hub, do you really mean router? Or do you have two static IPs?
If you have the APX serving IPs, then you will not be able to connect to the printer, since you'd be on a different subnet. But even if you disable this (which you PROBABLY should), you may still have problems. Very few routers out there bridge AppleTalk from wireless to wired. Once you get the APX set up correctly, try Renezvous instead of AppleTalk as the connection method. If that fails, you can always add the printer by IP Printing. Of course, you'll need the printer's IP first.
I'm guessing this thread will get the lock, as it really is an APX networking related thread. Actually you have two or three problems... Router vs. hub, APX config and printer connection.