About this 3D model

This idea is a remix of the http://www.thingiverse.com/thing:63123 to fit a Vision 3D Printer. It was remodeled and it fits a 40mm fan. Since I now have a 3D model that I can modify I may make new versions to fit a 50mm and a 60mm fan if neeed to cool the extruded plastic quicker. I added a new fan duct that I think is a better more efficient design.