How do I print to transparencies?

Only the Lexmark C750 colour printer has a paper tray dedicated to transparencies as 1) most people wish to print colour transparencies, and 2) the other printer print high volumes of paper and can't spare the space. Instructions for printing to transparencies on the C750 are available here. If you wish to print a large number of black-and-white transparencies, the simplest thing to do is to print single-sided paper copies and then photocopy to transparencies in the department office.