There are two poster-size printers in the building, one of which is in PIRL.
To use the PIRL printer, begin by reading the User Notes for the printer:
To print to these printers, you must have a PIRL user account. Please fill out the online account application form: New User Application Form. It may take up to one working day to get your account set up.
The easiest way to proceed is to being with a PDF file and generate a raster image.
42" is the maximum width. Render @300dpi.