alt Hacker NewsXerox had (maybe still has?) some printers with 5 or 6 color toner capacity. CMYK plus you could order special color toner in stock or fully custom mixes (minimum order sizes apply for full custom) but it was great for companies who had logos which could not be exactly represented by CMYK half toning as the spot color toner could be their exact logo color.
I’m sure the same kind of thing would be possible using Prusa’s documented methods with a little extra work.
I worked on a predecessor to that at Xerox at the start of the 1990s. The first was the Xerox 4850 which was the size of 3-4 clothes washers, cost several hundred thousand dollars, and printed at 50 pages per minute in black plus one color (Xerox called it Highlight Color), but no CMY. It was exactly for the logo use case you mention. A big customer was AT&T for printing phone bills with their blue logo on it. It let them replace many millions of pages of letterhead not sold by Xerox with blank paper sold by Xerox. Xerox loved paper phone bills.