The additive manufacturing (AM) process is known to have a major influence on environmental impact. To find out AM process with lower environmental impact in the product manufacturing process, this study compares material extrusion (Fused Deposition Modeling, FDM), powder bed fusion (Laser Sintering, LS) and material jetting processes (Poly-Jet, PJ) for 200 NIST test artifacts, using data from the specification and software of three 3D printers (J750, P770 and uPrint SE Plus), the findings from various literature and Ecoinvent of SimaPro 8.4 database. The results showed that the effects of materials on the environment were the severest for LS (20.45 Pts) and the least for FDM (10.38 Pts) although the effects of power consumption on the environment were severest for FDM (126.91 Pts) and least for LS (20.18 Pts). To reduce the emission to environment in PJ and FDM, it is recommended to improve their printing speed and reduce power consumptions of waterjet and auxiliary equipment for support removal.