Thingiverse
After dropping the spool in the picture several times with one of the other spool holders on here I made my own. It is simple and works. I printed it at 10% infill with 5 walls. It seems to be plenty strong.
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 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, this model is available as a free download 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.