Annular Cooling for Ultimaker V2

This is a replacement annular cooling for the Ultimaker nozzle. The original cooling shroud, although functional, can sometimes be counterproductive. The unidirectional nature of the cooling stream can sometimes lift the first layer, especially when printing on a raft. The annular cooling nozzle is aimed at the printed object from all directions, thus cancelling any possible lift.

This version 2 of my previous design. It has a larger annulus to prevent it from melting, more airflow and simple