The snap buckle have a central push button. The button need support to be printed. The rest is easy to print. The stl files are designed for straps in 20 and 26mm widths.

The parts have been arranged so that they are on the right side for printing. For assembly, one part must be rotated so that it fits together.

The samples are printed in standard PLA.

Edit: There is now an optimised and stronger version 2 in the download section