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Many experiments are currently using or proposing to use large area GEM foilsin their detectors, which is creating a need for commercially available GEMfoils. Currently CERN is the only main distributor of large GEM foils, howeverwith the growing interest in GEM technology keeping up with the increasingdemand for GEMs will be difficult.  We present here an update on the assembly and testing of triple-GEM trackingdetectors utilizing single-masked $40 \times 40$ cm$^2$ commercial GEM foilsproduced by Tech-Etch. The triple-GEM detectors will allow us to characterizethe overall quality of these Tech-Etch foils through gain, efficiency, andenergy resolution measurements. This will be done by constructing foursingle-mask triple-GEM detectors, using foils manufactured by Tech-Etch, whichfollow the design used by the STAR Forward GEM Tracker (FGT). The stack isformed by gluing the foils to the frames and then gluing the frames together.The stack also includes a Tech-Etch produced high voltage foil and a 2D$r-\phi$ readout foil. While one of the four triple-GEM detectors will be builtidentically to the STAR FGT, the other three will investigate ways in which tofurther decrease the material budget and increase the efficiency of thedetector by incorporating perforated Kapton spacer rings rather than G10spacing grids to reduce the dead area of the detector.

Construction of a Triple-GEM Detector Using Commercially Manufactured Large GEM Foils