The phrase "same printer" means that two or more things are referring to or using the exact printer, not a different one. It suggests that there is only one printer being discussed or compared, not multiple printers. Full definition
Between # 85 and # 240 was paid for the same printer cartridge from the same supplier by different departments and agencies, for example. (politics.co.uk)
The technique can also establish whether all the pages came from the same printer: if a sheet in the middle of a document does not have the same flaws as the rest it could not have been printed in sequence. (newscientist.com)
The same printer technology that sits on your desk could soon be a common fixture in rebuilding human tissue, treating burns by laying down layers of a patients» own skin or even rebuilding whole organs. (scientificamerican.com)