I bougth a 3D printer together with my brother. It’s not new technology, but it’s at a place where it’s solid and developed enough that I chose to buy one. That way I can spend my time with one as efficiently as possible, while developing new skills!
As for what you can do with it? Fixing stuff for example, a custom bracket that broke in one of my kitchen appliances is now easily fixable by measuring the broken part en replicating it in 3D software like Fusion360.