The file 'Cirkut No. 6 Outfit Camera Film Spool 3D Printer Model' is (stl) file type, size is 27.0KB.
This fits a Cirkut No. 6 Outfit camera, not a Cirkut No.6 camera. The spool is for a 6.5-inch film.
Print both files and glue them together with some CA glue.