If they waste my time ignoring my instructions, I return the favour with a lengthy response on every infraction with "the need to follow a structured troubleshooting methodology in order to be able to resolve the root cause at hand, including strict adherence to each individual step in the provided action plan, such that we can progress toward blah blah blah..."
After a few tries they usually get the message that it'll be faster to just follow the instructions 😄
Small anecdote, but I was getting print failures a few layers in with thermal runaway as the error code (with tiny oscillations of temperature fluctuating at the target temp seen on octoprint) after replacing the hotend for all metal (bimetal heat break, CR-10 copper block, screw in NTC 3950 thermistor) on an Elegoo Neptune 3 Pro. Turns out that the little silicon cover for the block was missing, and replacing it completely solved the issue.
“Not in a million years would I have predicted this outcome. I just wanted to make flying robots,”
No no!