E3D v6 30mm fan holder

UPDATED: There are 2 versions of this design

This is a remix of https://www.thingiverse.com/thing:1746358.

Made by reverse engineering a printed version of http://www.thingiverse.com/thing:1746358 using a caliper.

I made this remix because I liked the original design, but it was extremely difficult to remix it using the *.step file provided for download. Hope that this remix makes things easier for editiing the design. That's why I've included the original FreeCAD file, used to design t