that was something I never quite understood in star trek.
Like. with Voyager building the Delta Flyer.
What kind of incompetent, useless, dumbass engineers would have technology like replicators*, but then design spaceships that don't use that to build their own spare parts... or entire shuttles, etc. While we're at it... why design an exploration starship, whose primary power system wasn't built around fuels that could be easily replicated (and use transporters to suck in, iunno, astreroids, and then use that energy to produce said easily replicated fuel.)
*Replicators really should be called fabricators. replicators replicate themselves, like in SG:1. fabricators ... fabricate other things...
It's not necessarily that useful, mind you, but at least it's exciting.
I guess the thing to note is that if you are looking for a project, you probably could create some really good downloadable plans for an e-Bike that could have the key important parts printed on someone else's SLM metal 3D printer and it wouldn't even be especially silly or that absurdly priced, which would be a nicer argument for the superiority of bikes over cars if I haven't been unable to bike because of wrist problems for the past few years.
Be nice if there was an easy way to just do this with any car. Like, I'm willing to get you could get a rough model with FreeCAD and some references but it'd be really cool to have a drive through laser scan or something.