A bit outside the norm here, but steam mop.
First time I saw one in use and how well, and easily, it cleaned I knew I had to get one.
If you gents don’t have one, get one. It makes cleaning hard floors a breeze. And no waste or chemicals either. Just water and power.
Disclaimer: if you want the mop to last a good long time I do suggest distilled water. It will prevent the build up of the junk found in tap water.
I have a power mop that I freaking love. It's got a squirter built in as well as rotating pads that are easy to remove and clean. Makes cleaning my all hardwood floor house a breeze.
A backpack that opens all the way like a suitcase. My colleague showed one to me and I immediately copied him. I often take two day trips for work and now I can travel hands free!
Mostly utilitarian stuff I've designed myself. (I'm probably in the minority of 3D printer owners in that regard.)
Just some examples of things I've printed:
Of the above, the pegboard spacers, lantern rings, yarn bowl, and some of the Nintendo Switch mounting items were not designed by me. The Raspberry Pi desk mount case, toilet paper holder, and gift wrap were adapted from or used elements from things I found online for free.
If you want to see the kind of things that people make with 3D printers, thingiverse.com is a great place to get a feel for that. All the models on there are free to download and print. Yeggi.com is an aggregator for multiple sites full of models both gratis and for pay. (Yeggi's homepage tends to have uncensored NSFW models, just FYI.)