Department or college printers which are networked can be accessed using rlpr. Your file will need to be in a format that the printer supports, typically PostScript. To print file thesis.ps on printer grad-printer.college.ox.ac.uk you could use the following command:
$ rlpr -Hgrad-printer.college.ox.ac.uk thesis.ps
See the rlpr (1) and rlprrc (5) manual pages for full details, and consult your local IT support for information about printers in your department or colleges that can be printed to in this way.