This is my recreation of the original AMD Wraith coolers shroud. It is designed to mount to 92mm CPU coolers, specifically the Noctua L9x65. The fan to be used with it is the Xbox 360 slim CPU fan, these run for less than $10 on eBay or Amazon, and provide a surprising amount of airflow.
Sanding, lots and lots of sanding
Once taken off of the build plate, I worked my way through 160 grit to take down the ridges on the surface, then through 400, 800, and 2000 grit to finish them off. Wet sanding is highly recommended.