Hi. This is a great design. I printed out the 17mm parts for my Prusa i3. I think it will be a great addition if you can add provision for a anti backlash nut into t he X-Motor and the X-Idler.
Just extrude the threaded screw hole further down and add provision for a spring and a nut. If it is not too much to ask I can work on it if you can provide me STEP / IGES / SLD files.