Na₃PS₄ has been demonstrated to be a promising solid electrolyte material to be used in all-solid-state sodium batteries. Although, much research has been conducted on this electrolyte, there is no consensus on the optimal synthesis protocols that form similar material properties from the electrolyte. This work investigates the present synthesis parameters and variations and determines the critical parameters used to synthesize highly conductive Na₃PS₄. By using only ball milling, a single-step and scalable synthesis method was determined to form Na₃PS₄ from its starting precursors.