Prusa I3 Anycubic Nozzle Filament Cooler Ring

**Update (2017|03|19)** I added a new version, nozzlecooler3.stl, that has walls on the inside to make the air reach every hole. Also, it has some led mountings on top that can be disabled in OpenSCAD source code.

A nozzle cooler for my Anycubic I3 printer. I built it from scratch using OpenSCAD, but I got inspiration from [this thing](http://www.thingiverse.com/thing:1620630). The entire object is free (GPL). I rendered the .stl files at `$fn=150` and it took about one hour and 10GB RAM - b