Microfossils play a vital role in paleontology, geology, and paleoceanography. However, their small size makes them difficult to observe and renders them largely unfamiliar to the general public. We created enlarged models of radiolarians, representative of siliceous microfossils from the Phanerozoic, using micro-computed tomography (micro-CT) and a three-dimensional (3D) printer. The enlarged models are exhibited at the Geological Museum of the Geological Survey of Japan, AIST, and smaller models are also available for purchase. The smaller models allow the public to physically interact with microfossils. This initiative contributes to the dissemination of knowledge about radiolarians among the general public and supports the conservation of natural resources as substitutes for macrofossils.