I'd guess the physical print engine is a standard off-the-shelf piece of hardware made in bulk in China, and very likely all the mfrs use the same standard part

I'd guess the physical print engine is a standard off-the-shelf piece of hardware made in bulk in China, and very likely all the mfrs use the same standard part/s. So unless there's some kind of lock-in agreement, there would be no issue with a bulk order from some other party. Although given how printing is becoming a legacy tech, I doubt there would be enough interest to make it worthwhile today.