What would you have used in the 80s to make molds?

I still see that part as the most complicated and work-intensive in a small/home setting. I've been looking at ways, effort and prices for several years now and I'm still split between resin plus injection or just resin prints. And I am still end up with outsourcing as the result. But I'd really like to own that process... frustrating.

If anyone has a really feasible/well working solution for enclosures etc. please post them :)

That said, while I excluded the molding part explicitly, since I thought about CNC milling, pick /place and other computer-cobtrolled multi-axis applications, I think one could have used CNC and/or some kind of "sand" baking (negative) appoach. Not sure what kind of hard wood solutions might also have worked as some kind of medium for subtractive designing the negative for a small production run.

Still not something I would see as easily implementable. But I also have no lazy solution with nice results today. E.g. for implementing display windows some kind of professionally color-coated clear case seems the way to go to get to something that ressembles current standards (always the main problem, anyway). Hard to do that with limited space and without a professional absorber solution.