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Screwless Pin-mount Fan Grill
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:10541
whpthomas’ PLA Pin Connectors: http://www.thingiverse.com/thing:130879
(sorry about all the Thingiverse links)