I assembled a Prusa Mk3 a few years ago, and other than swapping a nozzle that wore out (they don't last forever) it's still working fine.
I grease it about twice a year, and clean any gunk from the nozzle (takes a few seconds) every so often. I wash the print bed thoroughly about 3 or 4 times a year.
I'm interested in 3D printing, but not interested in fiddling with the printer itself. So, I have fiddled to print soft rubber filament for example, but for every experiment with something strange like that I have 50 or more routine prints in PLA or PETG.
Yep this matches my experience pretty well! It’s been a good printer and I haven’t had to do much, and I avoid fiddling and mostly use it as a tool. I’m always eyeing the newer faster printers but I don’t love the cloudiness of Bambu and Prusa’s new stuff seems nice but not quite worth the leap yet. Voron has interested me for a while though.