I’ve had several printers over more than a decade. Even the most reliable new units can still be difficult to debug little things. My cousin’s family got a Bambu printer with no technical or mechanical experience and gets it working well most of the time, but there are still things that can bite you like prints not sticking to the bed because it has oils on it or filament breaking in the feed path because PLA absorbs moisture from the air and becomes brittle. A modicum of attention can keep these problems in check but the operator has to do some reading and learning.

There is another set of people who are in 3D printing because they like the experience of debugging and improving the printer as much or more than the final prints they get from it. The most hardcore 3D printing people I know don’t actually print much other than 3D benchies and test towers because their fun comes from playing with the machine and trying new parts. Those people build a different set of printer types than the plug and play units used by most casual makers.