40mm fan guard

It's a fan guard / grill for a 40mm fan. Useful for computer fans, cooling of 3D printer hotends, 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).

50mm version is here: http://www.thingiverse.com/thing:1594880
80mm version is here: http://www.thingiverse.com/thing:1579798
120mm version is here: http://www.thingiverse.com/thing:1581974

30, 50 and 92 mm versions will also come.