About this 3D model

I've 3D printed a lot of plastic buckles over the years, but I have never really been happy with how they have come out. They either seem to break, open just by pulling on them, require a lot of support or just don't fit together. So I decided to design a buckle that is better suited to 3D printing, this buckle is suitable for 50mm webbing/strap. It is best to print the male part of the buckle out of plastic that is suited to continuous flexing like PET / Nylon / PP and the female part out of something that is good at bridging, like PET or PLA.