[WIP] Ultimaker 2 (UM2) part fan shroud - no supports needed

[I've removed the models for the first version as they cooled the nozzle more than the part! ]

These ducts position the air flow around part under the nozzle better. 
Because the cooling is more effective you may need need to reduce max fan speed to 75%-60% to avoid heater errors.
Slotted mounts allow for height adjustment. 

These models print without supports. 
Print in PETG, ABS, ASA or other temp resilient material.
2-3 walls and ~30% infill should be fine.

 The picture block is a clone olson block.