Shock-absorbing F450 landing gear

Hi,
It is my idea for shock-absorbing landing gear for quadcopter with F450 frame.
2 legs on opposite sides should be connected some kind of elastic cord, spring or maybe strong rubber band. It should absorb some of impact of hard landing.
Finally printed. I had nothing flexible but it seems that the zip tie also works.

I added source file. Feel free to download, edit, upload it.