Customized version of http://www.thingiverse.com/thing:735449

The 60mm fans are used a lot to vent enclosures in my Christmas Light display, and last year I caught one cable, so time to cover the fans to stop it happening again. This customised version is 60mm across, 2 mm thick, no fan offset, and weighs less than 3 grams when printed with 20% infill. 5mm holes are centred 5mm from the edge, but most likely I'll cable tie them to the fan below.

Using the following options:

circles = 4
screwsize = 5
screwpos = 5
nradis = 4
percair = .75
inh = 0
screwcoversize = 5
fancoversize = 60
$fn = 128
fancoverheight = 2