Extruder Retainer

This retainer holds the extruder arms together opening the path for the filament. It frees up both hands for guiding and pushing the filament through to the hot end... or pulling it out.
It seemed like a good first project for design and production. So simple - what could go wrong?
It seems strong enough; I've had it in place for as much as an hour at a time with no signs of deformation. I'm sure that, over time, stress and fatigue will take its toll. Still, it only takes a half-hour and less than 2 meters of filament to make another.