Repair your broken key fob when your car remote key ring loop breaks or wears out.
See attached photos. Just cut off the broken part and file the end flat and rough up the back to create two 90 degree faces to glue the replacement ring to. I used super glue gel. I would think epoxy would also work. Printed in PLA + with 100% infill.
File or sand the edges and bevel the edge that is on the back of the key fob to blend.
I attached it to only the back half of the fob so that I could still get it open to replace the batt.