50mm fan guard

It's a fan guard / grill for a 50mm fan. Useful for computer fans, cooling of 3D printer electronics, etc. Prevents you from getting beheaded when you try to stick your head in the fan. Thickness is 2mm (or simply use the scale option of your slicer to change the thickness).

40mm version is here: http://www.thingiverse.com/thing:1585244
80mm version is here: http://www.thingiverse.com/thing:1579798
120mm version is here: http://www.thingiverse.com/thing:1581974