Based on mbasov’s Customizable Fan Grill from thingiverse: http://www.thingiverse.com/thing:71961 combined with parametric snap pins.The included STL fits most 120mm fans; you can clip this directly onto most fans without needing screws. SCAD file included so you can make grills for other size fans; this requires one of the following pin connector libraries to be saved as pins/pins.scad in the same parent directory as the fan grill file:tbuser’s Pin Connectors: http://www.thingiverse.com/thing:10541whpthomas’ PLA Pin Connectors: http://www.thingiverse.com/thing:130879(sorry about all the Thingiverse links)