Cờ lê mở nắp lưng đồng hồ 40mm

I needed a simple tool to change the battery in my watch. Unfortunately, a couple of tools I downloaded from Printables didn't work. The first one's teeth failed due to delamination, and the second one was impossible to grip. So, as usual, I decided to design one myself. It takes a bit longer to print compared to the shorter versions, but it provides a much better grip.

I've included the .step and .f3d files to make it easier to remix for other watch sizes.

I'm not sure if it's strictly necessary, but I decided to lower the layer height for the top layers where the teeth are located (see the slicer screenshot).