Replicator 2X Filament Fan Shrouds

the original ducts need longer spacers and longer M3 screws. These don't. You can use your old hardware.

REV2 has veins. I optionally use the first set because in simulation there wasn't much difference and I already have them printed and installed.

Also shown in the picture is a slick indicator holder you can find here http://www.thingiverse.com/thing:81430 or http://www.thingiverse.com/thing:85007 depending on the indicator used.