In my experience the term “printing office” was quite a common term to describe a printing establishment, The Old Guv was known as the Government Printing Office and most of the other States of Australia used the same term, it was also used in the United Kingdom and United States.
The term “print shop” was generally used to describe a small to medium printing establishment. It appears the correct terminology was a bit of an issue back in the 1890s
The 1897 British Printer article, below, sets out their thoughts on ‘Printing Office’ from that time.
Referring to the use of the term “office” as the name given to a printer’s establishment, The Printer and Bookmaker says:
“The dictionaries do not recognise any meaning of office which would justify its use for a place where printing is carried on. Properly, the business office of a printing office is the only part of the establishment entitled to the word. The proprietor and the book-keeper or typewritist are the only ones who are really justified in saying, ‘We are going down to the office now.’
The typos, pressmen, et al., should say, ‘We are going down to the shop,’ if they wish to be exact. Custom has sanctioned office, however, and its use is probably sufficiently fixed to last for centuries. This being the case, it is time that the dictionaries recognised the meaning in which printers use the word, that the knights of the stick may be backed by lexicographical authority.”