Clamps to use with my CNC machine

Greetings everyone !

I designed this clamp to hold my wood boards on my CNC machine, I used the same clamp made with wood before and I desired to make them from PLA, PLA can handle some flexibility better than wood witch cracks under pressure.

As usual you can find a video in this link :
http://youtu.be/k6T4DdvMyKA