Well, here at Dyess we are 3-D printing the controllers for the B-1 avionics system for pennies on the dollar. As well as replacement ICS switches, switch covers, and other cockpit components.
I don't think we're quite to printing a new engine from scratch, but if I can get even these plastic pieces in a day instead of weeks, for a fraction of the price... I'm all for investing in the idea just to see what airmen can make.
I'm old enough to remember bitching that the Air Force didn't want ideas from anyone below O-6. I'm sure as hell not going to shoot down airman Snuffy's good idea "because that's how we've always done it".