A calibre library can contain one of any type of file within its library/principal author/book folder structure.
I keep non-books in separate physical libraries (Journals/Magazines (mainly PDFs), Media (mainly MP3/4), and Photo Albums (CBZ). They are in separate libraries because I have different custom columns for each. The tricky bit is the way I use 'title/Title' and 'authors/Authors', e.g. for Journals the 'Title' column contains the 'name' of the Journal/Magazine, and the 'Authors' column contains the 'edition' which may be a date, a volume number etc.
I don't use calibre for entertainment audio/video, i.e. music, films, television shows. I use it for documentary and interviews from broadcasters etc. As well as the relevant audio/video file, I try to obtain/create a transcript.
DivingDuck uses calibre to manage embroidery patterns, which I imagine are in the same vein as 3D Printing files - i.e. numerical control.
BR
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