After a while i have found a simpler and easier design to work with
opload will come later

old post below

I have designed and tested a clamping system for a k8200 / 3drag printer
my design is base on http://www.thingiverse.com/thing:424674
you can download the technical drawings and the inventor file in downloads
READ THE INSTRUCTIONS

use perimeter shell of 3 or more
so there is no solid infill in the curve
this allows the clamp to bend easier