My beloved Golden Gate Park Tai Chi hoodie zipper pull broke off in the washing machine this week. I threaded a paper clip onto to the slider but it did not seem all that comfortable to use. A quick two sketch FreeCAD design and a 30mm long paperclip later and I had a satisfactory replacement pull for my hoodie.  

Once you print the pull, bend the ends of a small paperclip out from the center. See the included photo. Thread the clip onto the slider, and press the paper clip into the printed tab, so that the bent ends snap into place.