Different levels of approximation commonly used in simulation of SLM process (the case studied on 316L SS). In (a): the most ideal approximation considering the topological changes that follows the melt pool dynamics; (a1) gives the illustration and (a2) gives the simulated temperature profile and mass flow for P = 300 W and v = 1400 mm/s. In (b): approximation using geometry deformation from an initially uniform topology. In (c): multiple scan with P = 175 W v = 750 mm/s in (c1) and single scan with P = 300 W, v = 1400 mm/s in (c2) for an approximation without explicitly topological deformation.