Most likely outcome (assuming you make it to Iran) is they make a big show of congratulating you and setting you up with a super lavish lifestyle that is totally not a compound that you are definitely allowed to leave if you want but why would you want to with all the people trying to kill you

It’s not that they are particularly loud, it’s that the noise they do make tends to be quite “whiney” and high pitched and can get quite annoying after a while.

The problem with putting it outside is that big temperature swings (+/- 10C or so) could cause warping or other problems while printing - the plastic needs to cool at a fairly consistent rate, otherwise you end up with inconsistent sizing on your z-axis.

Filament itself also doesn’t like moisture, so if you live somewhere where you get close to the dew point overnight you could easily ruin the whole spool of filament

I’m surprised it’s not already in place for rail freight. Pre-defined, well known routes, automatic right-of-way. You’d need some exception detection - spot things on the line or if any part of the train is behaving abnormally, but like cars you can “fail safe” - do an emergency stop if the computer or a remote operator decides that something has gone sufficiently wrong which you can’t do in a plane

Technology wise, aircraft are already 90+% automated - autopilot does basically the whole cruise phase, pilots are there to do the communication with ATC, manage the autopilot, and be hands on for taxi, takeoff and landing.

From a legal/policy perspective, the aviation industry is held to a much higher standard of reliability and safety than the automotive industry - the AI driven YOLO that companies like Waymo get away with. It’s not just that autopilot systems have to always work, it’s that they have to always behave in a predictable way.