In this case, a 2BEIGH3 3D Printer was moved to the garage and used for measurements during actual 3D Printing. In short, the 2BEIGH3 is a large 3D Printer capable of printing several types of materials. You can learn more about the 2BEIGH3 here
In this case, a large plastic container was used as a temporary hood to collect gasses rising during the print. There is a 1.5" dia hole in the top for gasses to escape, and as they do they pass directly across the path of the sensor module.
The unit was prepared to print a part known as a "Material Certification Object". This is a part that is used to determine the quality of Nylon based printing material. It takes about 20 min to print a complete part.