Ultimaker Printing head structure

This is a new structure for the prinitng head of my ultimaker.

I've made this in order to replace all the stock wooden pieces.

Advantages:
-really light: only 14g with 0.8mm wall and 20% infill
-easy to mount and dismount

This is a work in progress. I've not mounted everything on the head yet.

Works perfectly with http://www.thingiverse.com/thing:45236

Edit 02 apr 13: new version V2 with a better grip on the bowden tube.