Additively manufactured lattice components provide ultralight yet load-bearing frameworks through their periodic strut architecture [1]. Stiffness, damping capacity and mass are governed mainly by geometry cell size, strut slenderness and the global relative density ρ*, rather than by the bulk material itself. For dynamically loaded components, the modal spectrum is critical: natural frequencies and mode shapes determine resonance resistance and fatigue life, and their values vary non-linearly with both topology and mass distribution [2]. The present study investigates a lattice based on the fluorite unit cell (Fig. 1a–c). Different relative-density levels were obtained by adjusting the strut diameter, while three discrete cell sizes were retained, enabling a direct correlation between geometry, eigenfrequencies and mode ordering. The resulting correlations provide design guidelines for lightweight components subjected to cyclic and stochastic loading.