Doesn’t have to be a thing you bought. Just some thing you didn’t have but then once you did it expanded your scope of actions.
The first obvious example that comes to mind is a car. Plenty of drawbacks to prevalence of cars, but being able to go where I want when I want, and far away, is very transformative.
I’m interested in other examples of things that aren’t just useful, but that open new possibilities.
Man, it sounds like you’d be an awesome addition to the community! Definitely approach it on your own terms, 3d printing can be as cheap or expensive a hobby as you make it (speaking as the owner of a Thessian Enser 3).
It’s incredibly powerful (and satisfying) to be able to fix the plastic bit of something and give it a new life rather than just throwing it away.