thingiverse
This is a really large OBJ file, based on the University of Dundee Museum Collections
CT scan of a nautilus shell.
Processed in Meshmixer - there's some degradation towards the center which is part of the original shell
https://sketchfab.com/3d-models/nautilus-shell-sectioned-7c9e391fbd5043e6bc1a044b9fb76905
Direct link to the original creator's page
Click the "View on thingiverse" button above to visit the original model page on thingiverse. You can download the STL file directly from the creator's page for free.
This STL file is compatible with most FDM 3D printers (Creality Ender 3, Prusa MK3S+, Bambu Lab, etc.) and resin printers (Elegoo, Anycubic). Check the original page for recommended print settings and materials.
Yes, this model is available as a free download on thingiverse. Some creators accept tips or donations.
Most STL files can be modified using free software like Blender, TinkerCAD, or Meshmixer. Check the license on the original thingiverse page to see if modifications are permitted by the creator.