> Years later, this still seems far out of reach. If anything, it seems to have been settled that most non-technicals don't want a 3D printer.

They would if you could print things out of durable materials that had weight and structure. I haven't seen any 3D printers that do anything except for that light resin-plastic that feels like you could snap it easily. But if I could print a PVC section for my sink that would totally change the calculus.

You're quite wrong.

You can, in fact, print perfectly well in any thermoplastic, including PVC (although it's unpopular due to toxic fumes). Nor is strength neccessarily an issue. In fact you can 3D print polycarbonate parts strong enough to scratch-build a drone - props and all.

No - the reason you wouldn't want to print parts for your kitchen sink isn't because you can't, it's because you rarely need such parts, and when you do you can simply buy off the shelf parts for next to nothing. A printer simply does not justify its overhead for most people. It's like having a lathe: useful if you're seriously into manufacturing or crafting, but not worth it if you want something pre-designed. There's just not much that it wouldn't be easier to just buy.

I actually printed a few PETG ones. They are nigh indestructable compared to PVC.

As noted above, it's the mechanical design / CAD that has to be seriously learned to do anything useful.