Diamond hotend print cooler

Added a new version with a thicker shell, for people with less well calibrated printers. I used the slim version, and have not testet the fat version (thicker shell) so let me know how the fat version works, if you choose to print that, please.

I have also uploaded source files. It was modeled in SpaceClaim, but I have added IGES and Rhino versions.

Printed object cooler for the diamond hotend.

Made to fit the original diamond_cooler_shield_blower.stl from the Diamond Hotend http://www