Uses a large (46.75ish mm) paperclip to replace the pull on a broken zipper. Bend the paper clip as shown in the photo, put on jacket as shown and lastly push replacement pull onto paperclip. Once you push it on, it will NOT (easily) come off so do NOT put on until it the paper clip is on the jacket. The inside is hollow but DO NOT print with supports, I don't believe you would be able to clean it up.
The author marked this model as their own original creation.