3d printing, wood working and carpentry is the trifecta of self sufficiency. 3d printing to make complex or small parts, wood working to build furniture, shelves and tools and carpentry to repair most everything in your house, from basic plumbing, electrician work, timber framing and dry wall repair.
I’m currently working my way down the rabbit hole, no 3d printer yet but I have some experience in CAD. Really the only things I buy brand new are tools to build more tools/stuff lol.