Thumb Roller Hook for Dial Caliper

This is a replacement part for the thumb roller hook that broke on one of my dial calipers. I made the part by injection molding polypropylene. I included the model files used to make the aluminum mold.

I don't know how often these things break but I couldn't find a direct replacement for mine. I did see some company selling a similar part that might have worked for ~$8. I think I bought the caliper for about $15.

Additional information about my injection molding process can be found at