Possessing an outstanding combination of biocompatibility and low bioresorption rates, Magnesium (Mg) alloys with Strontium (Sr) and Calcium (Ca) alloying additions have shown potential to be used as temporary implants in orthopedic and cardiovascular applications, eliminating the need for a secondary surgical operation commonly conducted for conventional non-resorbable implants. In addition, having a low elastic modulus (45 GPa) close to the human bone (1-30GPa) lowers the risk of stress shielding effects. Personalisation of Mg-based implants via Additive Manufacturing (AM) will widen the potential biomedical applications. However, safety concerns associated with the interaction of common high-power sources (laser or electron beam) with Mg powder limit the applicability of techniques based on Powder Bed Fusion (PBF). Novel processing technologies based on low temperature AM such as Fused Deposition Modelling (FDM) and Binder Jetting (BJ) can allow Mg components with complex shapes to be obtained upon post-processing. The main limitation is the low sinterability of common Mg-alloys. This study aims at the processing of Mg-Sr/Ca based alloys with improved sinterability through powder metallurgical routes. In this part of the work, the effect of powder particle size/morphology on the sinterability was investigated, initially using thermodynamic calculations to predict the liquid phase fractions and then, materials characterisation was employed to determine the effects of powder size and morphology on sinterability (porosity levels) using scanning electron microscopy (SEM/EDS) along with the X-ray diffraction (XRD).