I saved this for after market hours. There's no direct mention of TSLA, but I think it's relevant to Tesla's efforts at machines that build machines. There's also a bit about rockets.
Giant 3D printers for making boats, bridges, buildings and rockets
Printing bigger and faster
[...]
Since they appeared in commercial form in the 1990s, 3d printers have generally been employed in factories to make small things like prototype models, components of jet-engines and dental crowns. Now, a new generation of outsize printers is arriving. These are capable of turning out much bigger objects than previously possible, and printing them faster.
[...]
The Maine university printer is able to extrude material at a rate of 70kg (150lbs) an hour. At the moment it can make things up to 30 metres long, 7 metres wide and 3 metres high, but those dimensions could easily be increased by building a bigger gantry. The arm carrying the nozzle can also be fitted with processing equipment, such as an automated milling head to grind off any surface imperfections.
[...] an Oak Ridge system was used by contractors to print specially shaped moulds for concrete castings on the façade of a 45-storey building on the site of an old sugar refinery in Brooklyn, New York. Usually, such moulds are made out of wood by skilled carpenters and might last only three or four pourings, so builders get through a lot of them. But, Dr Blue says, the 3d-printed versions, composed of carbon-fibre-reinforced plastic, were able to survive at least 200 pourings.
[...]
3d-printed rockets, Relativity Space says, can be made faster and with fewer parts than conventional ones. The company has big ambitions. Its first rockets will be used to launch satellites but it hopes eventually to use its production system, which it calls Stargate, to print a rocket on the surface of Mars. When it comes to wondering what 3d printing is capable of, it seems, even the sky is not the limit.