Turns out 3D printers emit UFP (ultrafine particles) that can be harmful to lungs if in poorly ventilated areas.
The emission rates measured during the printing of small plastic figures were similar to cooking on a gas or electric stove, or burning scented candles and even as harmful as cigarette smoke indoors.
Now, consumers have a big choice to make. Create your own design and object using cutting edge technology or enjoy that scented candle? This is a tough one.