Protection of a fan

thingiverse

This is a protector which prevents the blades of a fan to be touched by small fingers, or by most of the accidentally sucked things. It does not reduce the airflow, and does not create any additional noise. This one is scaled for a 40 mm fan, but the concept can be rescaled for any other size. The 4 M3 bolts are deeply inserted into the colums in order to not uselessly increase the weight with longer ones. The SKETCHUP file is also attached.