This investigation aims to manufacture high-precision aluminum injection molds, utilizing CNC and manual milling machines, to produce Proton Tissue-Equivalent (ProTEM) slabs with thicknesses between 3mm and 5cm. The resulting slabs will be used to conduct Relative Biological Effectiveness (RBE) measurements by using solid-state microdosimeters. The manufacturing operations used for mold production guarantee that the thickness of each aluminum mold does not vary more than 10% along the entire 10cm by 10cm surface. This ensures that the slabs created by the molds have accurate thickness with minimal variation, and that their surfaces are flat enough to avoid gaps when stacking slabs and dosimeters for testing.