I had a 20+ Yr old car with a key fob that had broken, so it would stay on a key ring and wouldn’t stay closed.
Wreckers wanted $700 for a new key fob case as I’d have to buy the whole second hand keyless entry system.
A small 3d printer cost $650.
I bought the printer, then designed and printed my own key fob case, including replacing the worn out rubber buttons with some harvested out of an old kitchen timer.
No one was ever impressed or interested with the whole thing, so I figured this meets the criteria for inclusion here…
It was Flashforge Adventurer 3, and was $600 AUD, this was all pre COVID.