The file 'Customizable Solar Filter Holder Template 3D Printer Model' is (stl) file type, size is 4.8KB.
This will make a lens cap with a hole in it for holding a solar filter. The filter is sandwiched between the cap and a ring that fits inside the cap. The whole assembly is then slid over the lens/optics tube to help hold it together. It is recommended that they be secured with electrical tape when in use.
The original file on Tinkercad and the linked spreadsheet will enable you to customize it for yourself.
dPKoOFrk9iE.stl | 24.7KB |