<p>Laser-based powder bed fusion enables the additive manufacturing of high-quality metal components. Beyond extending its applicability to new materials, current research increasingly focuses on process control to ensure consistent and predictable mechanical performance. Precipitation-hardenable alloys such as 15-5PH are attracting growing interest owing to their high strength, stiffness, and corrosion resistance. Previous studies have predominantly addressed microscopic and macroscopic analyses, with particular emphasis on porosity, its impact on mechanical properties, and the effects of various post-processing heat treatments. However, thermal properties and dimensional accuracy, both dependent on the applied process parameters, are of considerable relevance for the subsequent applicability, as they exert a decisive influence on component design. In this context, the present work examines the mechanical and thermal properties obtained under varying laser powers and scanning speeds, and compares these with the achievable dimensional accuracy using a plate-based SC-BCC structure as an example. The objective is to identify a process window that achieves a compromise between high dimensional accuracy and desirable mechanical properties. The results demonstrate that low energy densities yield high dimensional accuracy but also high porosity, which degrades both mechanical and thermal performance. In contrast, high energy densities result in high mechanical properties but compromise dimensional accuracy due to increased distortion during processing. Within the investigated process window, a favorable compromise between dimensional accuracy and the resulting mechanical and thermal properties of 15-5PH was identified. These findings contribute to a deeper understanding of the process–property relationships and highlight limitations relevant to future applications.</p>