Wanhao I3 V2.1 Cobra Fan adapter

Dec 12, 16 - Update. Saw a few comments about the adapter do not fit. I enlarged the opening and give it some extra space. Now even printing at 0.2 mm resolution, there is enough room. Also, I made an new version for the Cobra Fan with the horizontal fan mount. The -23 is for the vertical fan and -39 version is for the horizontal fan.

Sep 11, 16 - Updated base on comment and added a slot. It should fit the fat and non-fat version of the cobra fan. Use version 9. Previous version is th