Seiko Watch Case Back Socket

I created this tool to help with opening and closing the case back on my watch.  It's confirmed to work with a Seiko SBDC051.  This might work with other models that have a 30mm distance between the case back slots.  One of the photos shows this dimension.  

I modeled gripping surfaces around the circumference of the socket so it can be turned by hand, and also incorporated a square hole to be used with a 1/4” ratchet if extra torque is required.

I printed mine in PLA with a 0.4mm nozzle, 0.2mm layer height, 4 perimeters, 5 solid top and bottom layers, 20% gyroid infill.  No supports required.