This should work from any Mac (laptop or desktop) connected to the Cambridge University Data Network. This includes eduroam and UniOfCam wireless. You will need a Genetics DEPT account and you must have changed your password at least once (DEPT accounts don't work fully until you've changed them from the initial letter.)
(Screenshots from 10.6, tested up to 10.10)
Open System Preferences. Select the "Print & Fax" option from the second row
Optional, but Recommended: Reset the printing system by right-clicking the printer list. This will remove any existing printers.
Press the + button in order to get the "Add Printer" dialogue, then customise the toolbar. If you already have the "Advanced" gear icon click it and skip editing the menu bar.
Add the "Advanced" gear button to the toolbar by dragging it from the palette onto the toolbar.
Click "Done" then click the advanced button and fill out:
|Library Colour||smb://print.gen.private.cam.ac.uk/LibLaserCol||Samsung CLP-770 Series|
|Library Black & White||smb://print.gen.private.cam.ac.uk/LibLaserBW||Samsung ML-4550 Series|
|2nd Floor Computer Room||smb://print.gen.private.cam.ac.uk/R222BW||Samsung ML-4550 Series|
Detailed info on Library Photocopier
The first time you print a document it will probably be put on hold. Open the print queue (there should be a bouncing icon on your dock)