It will release some fumes. Make sure you have good ventilation. Other than that, I read the Material Safety Data Sheet (MSDS) for styrofoam and didn't see anything glaring going on there. Watching the video it seems like the styro rapidly solidifies as the cutter goes through. The lady said she had a fan on but I would prefer an open window with a reverse fan to direct fumes out, especially if one were spending a lot of time doing this. That's just my take on it. I spent the last three years of my career studying and writing up chemical safely protocols and they were very strict on safety measures; too strict for my taste!
