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Sorry to hear the Piranhaz didn't clip/bite on as expected. As the images show (including lots of other members photos) when well printed they do make great little pegs / clips. However, unfortunately not all printers or slicing apps can deal with small things and fine tolerances as well as others. That could well be the case here... other possibilities are that you didn't follow the instructions provided as you must use higher infill and shells than usual. This is what gives it adequate strength. Under extrusion (not enough filament being supplied due to slicing app settings or a machine issue) will also make prints weak.

Hopefully these suggestions help. As already mentioned and you can see in the images they do function well when printed well...