[kuon]

Do you have a recommendation for a laser printer manufacturer with no locking (third party toner, ok...) and no steganography (invisible dots)?

[mysterydip]

Not sure on the invisible dots, but brother allows third party supplies: https://support.brother.com/g/b/sp/faqend.aspx?c=us&lang=en&...

[kuon]

I remember this:

https://news.ycombinator.com/item?id=31860131

I do not know how brother fares now regarding open supplies.