It's not the machine putting out toxic fumes, it's the ABS plastic film being heated to be formed into the 3D shapes that is releasing the toxic fumes, anytime plastic is heated it releases dangerous things, which is why Mayo Clinics and Johns Hopkins University say to never microwave or heat food in a plastic container because the toxins are released and absorbed into the food. They did mention in the article PLA plastic is derived from cornstarch and sugar cane and has less toxins, so I think we need education so that people choose the PLA instead when buying the printing materials, or we could petition to ban ABS.

The Mayo Clinic and Johns Hopkins don't say never to microwave or heat food in a plastic container. There are a couple of biased studies that were published on the websites of both institutions exploring theories, but they are of limited scope. CERTAIN plastics shouldn't be microwaved. Additionally, if you microwave with a container too many times, or for too long a duration to over-boil a substance, it could eventually degenerate the plastic. I've burned sauce in a microwave; it heated up SO hot that it melted the plastic. So of course I threw that container away. Use common sense, use only plastics that are designated as safe for microwave use, and avoid tin-foil-hat conspiracy theories. I've heard they cause cancer :)

http://www.health.harvard.edu/staying-healthy/microwaving-food-in-plastic-dangerous-or-not It is a fact that heating plastics releases things that are harmful to human health. The exact makeup of plastics changes depending on what type it is, supposedly certain types are deemed "safe to microwave" by the FDA, but the FDA is corrupt and have approved many things that aren't really safe for everyone and their tests to ensure "microwave safety" of a product are not based on all the ways a person might use them. If you look at most people's plastic food containers in their home that they use for food storage, there is warping and damage there. Technically it might have been "safe" to microwave in the beginning, but it isn't after a while. Rather than asking people to become experts on the subject, the easy way to put it is don't microwave plastic at all if you care about your health. I've dealt with serious health issues due to exposure to pesticides in my neighborhood and chemicals in normal household toiletries that are supposedly "safe for use" and therefore I am skeptical about what is on the market in the US and I will always be cautious because me and many people who are already sick don't have the luxury of taking that risk. Every few years we find out something that was previously deemed safe and approved by the FDA or USDA is actually making many people ill. What I mentioned above I'm not talking about the "dioxin email hoax" that went around, I never got that email. I did read on Johns Hopkins website and several Mayo Clinic websites when I ran a medical support group a few years ago, that they recommend against microwaving plastic, whatever the kind, because heating plastics releases BPA and phthalates which are endocrine disruptors-meaning they upset the balance of hormones in the body. It is widely known that BPA when put into the human body becomes like a synthetic estrogen and of course no one would want to be unknowingly putting estrogen into their body.

A couple of quotes from this Harvard Medical School article about plastics and the microwave: "The FDA long ago recognized the potential for small amounts of plasticizers to migrate into food. So it closely regulates plastic containers and materials that come into contact with food. The FDA requires manufacturers to test these containers using tests that meet FDA standards and specifications. It then reviews test data before approving a container for microwave use.

Some of these tests measure the migration of chemicals at temperatures that the container or wrap is likely to encounter during ordinary use. For microwave approval, the agency estimates the ratio of plastic surface area to food, how long the container is likely to be in the microwave, how often a person is likely to eat from the container, and how hot the food can be expected to get during microwaving. The scientists also measure the chemicals that leach into food and the extent to which they migrate in different kinds of foods. The maximum allowable amount is 100–1,000 times less per pound of body weight than the amount shown to harm laboratory animals over a lifetime of use. Only containers that pass this test can display a microwave-safe icon, the words “microwave safe,” or words to the effect that they’re approved for use in microwave ovens."
Also: "Most takeout containers, water bottles, and plastic tubs or jars made to hold margarine, yogurt, whipped topping, and foods such as cream cheese, mayonnaise, and mustard are not microwave-safe.
Microwavable takeout dinner trays are formulated for one-time use only and will say so on the package.
Old, scratched, or cracked containers, or those that have been microwaved many times, may leach out more plasticizers.
Don’t microwave plastic storage bags or plastic bags from the grocery store."

Notice that the tests were done on lab animals only, and that the parameters were what the researchers thought would be "ordinary use"--that's not necessarily how people really are using it. A huge number of chemicals approved for use by the FDA in U.S. cosmetics and H&B products are banned in every other developed country for it's clear ties to health hazards, and often cancer. The meals in public schools were supposedly FDA approved and they were shown by many reports to be very unhealthy. You can't always trust a government agency, especially when the companies getting rich off plastics, chemicals, and pesticides have powerful lobbyists.