When bulk rolling film, the cut end must be shaped to be accepted by the take-up spool inside the camera. Cutting this incorrectly can lead to film tearing or may not be accepted by some auto-winding cameras.
This two-piece template clamps the film and provides and edge to run a utility knife along, cleanly cutting the correct standard shape.
Based on the free model by Rodsgear: https://www.printables.com/model/117667-35mm-film-leader-cutter-template
Colour may vary