This is kind of out there but... are there open-source laser printer designs? I guess the key elements (scanner, toner dispenser, heater) aren't exactly commod

This is kind of out there but... are there open-source laser printer designs? I guess the key elements (scanner, toner dispenser, heater) aren't exactly commodity/interchangeable, so maybe better: are there open-source laser printer firmware? I feel like the technology has been established for a few decades now, and the latest consumer iterations often add ridiculous "features" and outright user-hostility that maybe there's room for an alternate solution. Edit: see rdw's answer elsewhere here, for why a laser printer is a pretty complicated piece of control system