Geeetech MK8 part cooling

Part cooling duct, attaches to the MK8 radiator then redirects the air to the printed part.

History: This is my first design for my printer. It was inspired from a number of other designs. Really improved the quality of my prints (PLA). It has it's drawbacks: some angles are not efficiently cooled, one may want to delay a bit the head cooling till first couple of layers are printed. All in all was a great step in progressing with 3D printing, allowed to print good enough parts for my second printer. I thought might be useful for others on similar journey.