Henry Cavill as August Walker, a CIA assassin working for the Special Activities Division tasked with monitoring Ethan and his team. He is also the real John Lark who contacted the Apostles to steal the plutonium cores.
Per Wikipedia under the Cast section.
Deadline, who first reported the story about Tom Cruise planning to shoot a movie aboard the ISS, stated (albeit without providing a source) that the planned project was "not a Mission: Impossible film". Mission: Impossible 7 had already begun filming prior to the announcement, and I can find no details regarding Mission: Impossible 8's filming schedule at ...
A CNC machine could do the same thing. It's a 3D printer, however latex is a tricky substance since it starts off liquid and requires time to cure. So the machine would work, but far slower than the movie.
Also, remember that when Jim is talking to Ethan in London about Kittridge he’s talking about himself and talks about a marriage in trouble.
In the prologue, Claire is "dead" after having seduced the mark. This had to have put more stress post-marriage.
The feelings for Ethan at the end were the final straw. He was cutting all loyalties.