About this 3D model

This is my first upload. I had trouble to use the http://www.thingiverse.com/thing:138500 x-carriage because it was vibrating. My design keeps the weight of the extruder above the rails and has very good positioned fan mounting holes. My J-Head Adapter: http://www.thingiverse.com/thing:441236 Fan duct: http://www.thingiverse.com/thing:441233