It will be too loud to put it in my apartment (
It should be fine. It's no louder than an automatic dishwasher.
You need it some place very convenient or you won't use it.
Does the UM need ventilation when it works? Does it generate any fumes or gases?
Almost zero ventilation needed if you print PLA. Some people say PLA smells like popcorn. It has very little smell. The smells/gasses are much less than say from cooking toast or soup.
If you print ABS you will need ventilation and might want to print where you can open the windows.
Risk of smoke or fire?
Yes but quite small. Ultimaker did tests where they left the hot end on so that it would overheat to the maximum. I don't think anything caught fire. There are 2 or 3 software safeguards to keep the hot end from getting out of control but it still happens occasionally.
>Could it help (or be necessary) to install a smoke detector,
>maybe even a webcam to be safe?
Yes! So you can see if your print failed and you can abort it remotely.
>I could couple the smoke detector to the mains supply so that the UM will be cut off from power when there's a smoke alarm.
Not worth the trouble.
I would put it in a study. It should be in a clean room - not a dusty room. Dust can stick to the plastic filament and clog your nozzle and cause lots of headache. It should be in a well lit area because you will often be looking closely at your print as it is printing. Trying to figure out if your bed is too low or too high or some other issue. So kitchen is probably too dirty (especially if you cook with oils). But dining room, living room are okay but not best. Bedroom is okay. Study would be best.
I'm not really sure, that there any danger in using ultimaker. I use it at home, printing with PLA, maximum time of print I had 5 hours, no any problems. Some visible fumes or gases no, maybe you will feel some smell of corn during use PLA.
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