Tool to Open Fuel Pump Cover (Mazda)

I had to replace the fuel pump on a Mazda 6 but the cover does not open easily. There are tools available which are made from steel and can be adjusted for different diameters, but I couldn't get my hands on one of these and it was a long weekend so I decided to print one.

The tool fits very nicely and worked surprisingly well. I used a hammer handle to get the necessary torque for opening.

This is the second try, my first design cracked due to warping at the print. This design has large holes to prevent the warping.