Here is a 3d-printable tool to unscrew the battery cover of your Fossil watch.
It is designed for watches with a 39mm cover diameter.
It's made of 2 parts. I originally thought only one would be necessary.
But torque on my watch was too high, so i had to design a handle to make it work.
I suggest you print the ring first, and then the handle, if necessary.
Your comments are welcome.
Grossiste 3D PLA