What to print

Hey Im getting into 3d printing and wanted to try printing something small like a glock, thing is I dont have a printer and was gonna use my universities printers that are free for the students. To make it less conspicuous i would want to print something in many little parts as opposed to a big one, ik glock bodies take a minute so idk if could do that. Any ideas? I also have to keep each print shorter than 8 hours