I have the XYZPrinting da-Vinci-1.0 with ABS filament. I am concerned about ventilation. If this is used inside, what safety precautions are necessary, which are recommended, and/or which are optional?
Yes... The issue with all 3d printing materials. Not just ABS, but worse with ABS is the fine air particulate and Ultra fine it creates during the 3d printing process. PLA is considered safer than ABS. But I fear people will use this as justification, it is like saying I only smoke one cig a day instead of two so I am safe and healthy. No it really should be taken seriously.
There are a number of scientific papers and articles proving that this is an issue. Specifically that 3d printers release ultra fine particles into the air. Which can damage the lungs over time. I would STRONGLY advise not using a 3d printer around children, or at least putting it in the garage where you will not contaminate your homes air supply.
Lot of these have some scary looking graphs. Note that I am being a bit sarcastic when I say "scary looking graphs" the take away is ABS has twice the Fine Partical emission as PLA. However should you be worried, is still up to debate. The idea is that FPE can maybe contribute to cancer or other illnesses. FPEs are thought to irritate the lungs.
as you can see PLA is MUCH safer in this regard.
I cannot find the paper at the moment, but the recommendation is a full air cycle several times an hour. As someone that lives in a Cold state I personally just use PLA and am rolling the dice.
There is another SO where I cover my future plans for an air scrubber.
I will note that other materials such as Polycarbonate should just be plain avoided.
I also want to provide these links on WHY ultra fine particles are bad. In summary they really upset your lungs and are thought to cause lung cancer over time.
Most reputable suppliers of filament should have MSDS (Material Safety Data Sheet) available for the material they are providing. This sheet should provide you with some mechanical, electrical, and chemical properties as well as safety concerns. For the most part an ABS MSDS will tell you that it can be harmful to inhale or consume ABS in any phase state (solid, gas, liquid, etc.).
I haven't printed much ABS but I rapidly realised that printing ABS in an enclosed space soon fills up with fumes, which apart from their toxic nature, see answer above, really stink. I close off the print space rest of the house and wear a two-filter painters respirator when in the same environment and ventilate the room when finished - I live in a temperate zone so leaving the window open isn't always an option and drafts can affect the print. Ideally, I should enclose the printer and filter the airflow but for the amount of ABS I print, it's not an economic option so a respirator it is.
your fine at practical temperatures. source: https://en.wikipedia.org/wiki/Acrylonitrile_butadiene_styrene#Hazard_for_humans
recommended would probably be set your controller to not go above 380c if your really worried. but it's not needed.