Abstract: Material extrusion additive manufacturing of metal (metal MEX), which is one of the3D printing processes, has gained more interests because of its simplicity and economics. MetalMEX process is similar to the conventional metal injection moulding (MIM) process, consistingof feedstock preparation of metal powder and polymer binders, layer-by-layer 3D printing (metalMEX) or injection (MIM) to create green parts, debinding to remove the binders and sintering tocreate the consolidated metallic parts. Due to the recent rapid development of metal MEX, it isimportant to review current research work on this topic to further understand the critical processparameters and the related physical and mechanical properties of metal MEX parts relevant to furtherstudies and real applications. In this review, the available literature is systematically summarisedand concluded in terms of feedstock, printing, debinding and sintering. The processing-relatedphysical and mechanical properties, i.e., solid loading vs. dimensional shrinkage maps, sinteringtemperature vs. relative sintered density maps, stress vs. elongation maps for the three main alloys(316L stainless steel, 17-4PH stainless steel and Ti-6Al-4V), are also discussed and compared withwell-established MIM properties and MIM international standards to assess the current stage of metalMEX development.