<cough>Additive manufacturing?</cough>
The first four minutes or so of this video are about the economics of 3d printing with metal and why it is - for now, anyway - restricted mostly to just prototyping rather than mass production.
Then there's a bit of coverage about testing 3d printed parts - particularly in fatigue strength - as compared to traditional machined parts and a bit of explanation as to why their fatigue strengths tend to be significantly lower - including a micrograph exploration of metals while they are sintered . It's surprising to me that there isn't - at least shown - an example of a sintered piece of metal being tested.
Overall, the video is a nice exploration of why mass produced engines will likely not be made by 3d printing experts in the immediate future.
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