Abstract: The radula is a crucial adaptation for food-processing in molluscs.A deeper understanding of the interaction between the radula and the preferred food is lacking, complicating the inference of the precise ecological roles of radular structures.　This study presents the first experimental set-up that allows to study the influence of the radular morphology, specifically the degree of tooth-tooth interlocking(so-called collective effect), on the feeding efficiency. For this purpose, physical 3D models of the teeth were designed using CAD software and 3D printing technique. The feeding efficiencies with models of different degree of interlocking were determined by tensile tests, pulling the models trough agar gels with different viscosities. The forces generated by the models and the masses of the removed gel fragments were determined. We found that radular models with a high degree of tooth-tooth interlocking performed best as they were able to remove most agar We additionally broke the teeth and determined, that the teeth with the highest degree of interlocking could resist to high-est force. Overall, the study highlights the complex interplay between radular morphology and its ecological function, suggesting that even minor morphological alterations can significantly impact the efficiency and effectiveness of food gathering. Understanding these interactions cannot only shed light on the ecological adaptations of molluscs, but provide further insights into development of more effective grinding, scraping, and cleaning technical devices

Key words: Mollusca')">Mollusca, Feeding, Mechanical behaviour, Breaking stress, Tensile test, 3D printing