The objective of this work is the characterization of a UV-curable metal-filled resin suitable for the production of metal components with an additive manufacturing process based on stereolithography. The major focus is given to the integration of an aluminium alloy powder into an acrylic resin curable through irradiation of light with wavelength equal to 405 nm. Different powders are considered and their effects on suspension stability and curing kinetics are analyzed with rheology and photo-rheology tests. Air trapping phenomenon have been investigated and reduced with a vacuum mixer and some defoamer have been tested. The suspension stability and the resin viscosity have been adjusted by balancing the base resin composition and with the integration of proper rheological additives.