I did receive a reply from Samsung which I will repeat below but I am afraid it did NOT help.
My solution was to purchase Printopia which allows the iPad to wirelessly print to the Samsung Laser using the MBA as a print server, i.e MBA has to be open and powered up. Ditto printing from my iPhone or old MBP. Works fine and reliably albeit a little slow, typically from PRINT command on the iPad of an A4 page to it appearing wirelssly on Samsung is circa 90-120 seconds.
Samsung reply was as follows
"I see in the specifications for this printer that it is compatible with mac os x 10.3-10.6 so there may be compatibility issues with this printer and newer versions of the mac operating system. This beeing said it should be able to connect to your network.
The problem you are having could either be a software issue or a problem with your router, please follow the below instructions which will hopefully get you up and running.
I would recommend that you connect the wireless printer directly to your router via ethernet cable, wait 2 minutes and print off a configuration page on your printer(please refer to your user manual if you are unsure how to do this.
On the configuration page you will find the ip address for your printer. Then using your laptop go onto the internet and in the search bar please type in the printers ip address. This will bring up our Sync thru web service. You are looking for ‘network settings’ please click on this, another page will open, along the left hand side you will find a list of options, please click on ‘wireless’.
Another page will open up, scroll down the page and please select ‘wizard’ and click ‘next’. The next page that comes up should give you a list of all available networks to connect to, select the SSID of the network that you are connected to and click next.
It will then ask you to confirm settings and click on ‘apply’. You should then find a box opens that says “your selections have been modified successfully, please click on ‘ok’.
Now go back to your printer and unplug the Ethernet cable, wait a few minutes then a blue light should show on the printer (this light stands for wireless signal), now the printer is connected wirelessly to the network. Then go to the laptop and install the print driver.
It should ask you about installation type select ‘typical installation for network printer’ and click next. It will then search for available printers and will show you a list.
You will see 2 names for the same printer- one with ‘local port’ and the other with the printers ip address. Select the option with the ip address and click on ‘next’. The set up will copy the files when it finishes, it will ask you to print a test page, click ‘ok’ and it will print off the test page for you.
You can also find downloads on the apple website for samsung printers visit http://support.apple.com/downloads/#samsung "
Hope this helps
kbjpick 2nd April 2012