The objectives of this review are to systematically summarise and present the current status and available data on metal MEX, including feedstock, printing, debinding, sintering and physical and mechanical properties. The available metal MEX data are compared to the conventional MIM process and MIM international standards. The topics of this review are presented in five sections, which are Section 1—Introduction, Section 2—Material extrusion additive manufacturing of metal, which reports on types of metal MEX and process variables, i.e., printer equipment, alloy and powder, feedstock, printing, debinding and sintering; Section 3—Effects of processing parameters on physical and mechanical properties of metal MEX parts and comparison with MIM parts and MIM standards; Section 4—Secondary processes, which can improve the properties of metal MEX parts; Section 5—Current, prospective applications and future direction of metal MEX development and; Section 6—Summary. In sub-sections of Section 2, MIM will be introduced first and then metal MEX will be discussed because MIM is better well established. In Section 3, the MIM international standards are used because there is currently no international standard for metal MEX. The MIM standards are the Metal Powder Industries Federation (MPIF) federation (MPIF) Standard 35 Metal Injection Moulding Materials for stainless steels andJapan Powder Metallurgy Association (JPMA) Standard Metal Injection Moulding Materialsfor Ti-6Al-4V. The information from this review will not only be useful for researchers, whowork in the fields of 3D printing and powder metallurgy, metal MEX and MIM, but alsowill promote the development of the metal MEX to be widely commercialised.