Thingiverse
Galile0's creative reuse for CD cases inspired me to get out of box, literally, and into a pentagon. The resulting structure is quite sturdy and can connect many layers high. A snug fit is important so you may have to increase or decrease the scale by a percentage or two depending on how your printer is calibrated.
Direct link to the original creator's page
This model is published by its creator on Thingiverse. STLFinder only indexes it: the "View on Thingiverse" button above opens the original page, where the creator shares the STL files under their own license.
This model 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, the creator shares it at no cost on Thingiverse. Some creators accept tips or donations.
Check the license (see original page) on the original Thingiverse page. Most STL files can be modified using free software like Blender, TinkerCAD, or Meshmixer.