I would expect any plastic parts enduring 122°F or above for the first few times would emit excessive monomer gasses. Like Bill, I have experienced no significant plastic odors, but then I also haven't used the unit above 104°F for anything but brief testing. Without even turning the machine on when I first got it, there was a trace odor of plastic, but that's pretty common with plastic parts in general. My suggestion is similar: if you plan to use the unit at high temperatures, set the unit at its highest temperature with the door closed, let it remain at that temperature for several hours, open the door to let any gasses out, and repeat until you don't smell any plastic. Keeping the door open while it is trying to heat up won't allow it to reach its highest possible temperature, which is part of the the point of the exercise.