I too know Dan quite well .We first met at a Dinner at one of the Rhinebeck RC fly-ins.
When I lived in Austin, I would often stop by his warehouse to pick up part and stay for a chat
He told me that many of his machines needed to be upgraded, and that was an expensive and time consuming operation.
I don't disagree with anything you said, but I do think that when today you compare 3D printed parts with Injection molding it
is like comparing a Typewriter to Computer.
Very useful in their time, but now outdated..
Sad, but I am afraid true.
Please engage Brain before operating tongue or machinery.
"Scale Detail equals Weight"