This printable side-release snap buckle has been designed so that both sides print flat on the print bed, which allows the layer lines to be optimally oriented to create an impressively strong functional buckle.  

Carefully designed so that no supports are needed, and versions to support standard straps of three different sizes are included.  Specifically strap widths of:  2 cm (.75 inch), 2.5 cm (1 inch), or 3.2 cm (1.25 inch).  The version shown in most of the featured pictures is the 2.5 cm version.  Works well in PLA, but PETG is even better.