I've talked about Relativity Space and their concept of 3D printing virtually everything in their rockets - including the rocket itself - several times, most recently in June. They're continuing work toward the first flight of their Terran 1 rocket later this year. That linked piece emphasized their plans to develop a large rocket to compete directly with SpaceX's Falcon 9, to be called the Terran R where the R is for reusable.
Tonight's emphasis is to direct you to a worthwhile 20 minute long video on the YouTube channel Veritasium. It's 10 days old, but I finally got around to watching it and would recommend it to any space nerds or techno-geeks. It certainly went faster for me than 20 minutes of most TV programs. Veritasium's lead, Dr. Derek Muller, conducts a walk around interview with Relativity CEO Tim Ellis. They carry UV protective masks to watch large metal prints being made, watch the bell nozzle of a rocket engine being printed, stand along side the Terran 1 slated to fly, and lots more.
The video includes a lot of things worth watching, including time lapse photos
of how they 3D print rockets, and engine parts. There's a lot of details
in here; Muller gets input from Scott Manley on several technical
It's also fun to see Tim Ellis in more detail than I've seen before. He's clearly a space nerd and you get a great feel for his passion about rockets and technology. It comes across clearly that he's building Relativity because he sees it as an existential part of being human. His vision is for expansion to Mars, like Elon Musk's, but sees different ways to achieve some of these things.
Relativity's Terran-R concept rendering.