Ariane says they're getting into the motor printing game. ArianeGroup supplier GKN to 3D print turbines for reusable Prometheus engines - SpaceNews.com And relative to this being a SpaceX forum, there are some interesting buzz words in there, namely 'Reusability' and 'Methane'. Also interesting is potential compatibility of this motor with Ariane 6. That seems a bit of a stretch for me since A6 has a [hydrogen burning] Vulcain in the caboose, but I suppose stranger things have happened. I'd bet its more likely going to see first use on a new A6 upper stage. Anyway, as always, the more the merrier.