This part attaches a Raspberry Pi in a slightly stupid case I have to an external hard disk. There wasn't really a way to print it without at least some kind of support material...except leaning back at a 45 degree angle. This printed entirely without supports.
It used to be normal to print on glass/mirror beds...it hasn't really been a thing on printers for some years now since spring steel PEI sheets became the standard even for the cheapest entry level printers. So my guess is this is either a fairly old printer or a homemade budget-printer.