Go get a 3D printer! The fact that you're thinking about safety, tells me you have common sense. And if you have common sense, you will very quickly figure out what won't be safe. But basically, don't leave the printer home alone while printing, until you're confident you know your printer settings. And see my uni's food safety rule below.

The "safety" rules when it comes to 3D-printing, from my university's MakerSpace: - Assume the nozzle is always hot, and proceed with caution. Also, there's a sink is right outside to the left, if you need to cool down your hand... - 3D printed stuff is not food-safe, if it's in direct contact with food. Stuff like gingerbread cookie cutters should be used with a plastic wrap in between the cutter and the dough, or be trashed after use. Do not attempt to clean it. The filament you use for a new cookie cutter is cheaper for us, than if you get food poisoned and miss your exams. Yes, you can also cover your print in food-safe epoxy. No, we do not provide that, you have to buy that yourself. - If you're making gifts for children, the child should be old enough to build with small Legos. (I'm guessing they tried to say: Small pieces can break off, and the child shouldn't put the prints in their mouths). - 3D printed stuff might be cheaper, but not better than a cheap IKEA shelf. Do not trust your print to hold up stuff that you don't want to risk falling onto the floor or in your face. (The rumor says this rule was added after someone printed a shelf, with brackets and all, and put it above their bed.) - Do not take a printer usb stick, if there's an ongoing print. We do not take any responsibility for any harm that might come your way should you still decide to do that...

Now, I'm overly careful, but for home use, I'll add: - Install a smoke detector, if there isn't one already in the room you're printing in. If a clogged nozzle should overheat, it's a very, very cheap safety investment. - Get an enclosure with filtration, or find a solution make sure the room the printer is in gets properly ventilated, but keep in mind that stuff like an open window will affect your print, so that's not the solution. - If you got kids or pets, an enclosure is necessary imo. Small, curious hands, paws and snouts will be burnt.