Please do not attempt to use the large format printer in the mac lab for halftone color separation prints. It prints a dither pattern rather than a dot, and will not do what you want - like with the laser printers in the shop. An alternative is: to tile your image using illustrator to print out larger (instructions in the screen tech manual) or go to an architectural reprographics store and have them print out your file large-scale. I have had problems with the consistency and darkness of the toner at Kinko's, and don't recommend them. Remember: The most important thing is to not be able to see light coming through the black areas of your print-out before exposing. If you do, it is not dark enough and will not burn properly.

You may use the large format inkjet printer in the mac lab for line work + images that do not require a halftone, however, you need to print out two copies and double up your transparencies before exposing. The inkjet toner is not dark enough as one layer.