Added version of the cover for the R3 release of the Prusa Extruder body. Due to some changes in the extruder body design, the fan cover needed some modifications. File name is: Noctua fan cover MK3_R3.stl
I assume that consequentially if you update your MK2 extruder to the R3 version of Prusa's extruder design this cover might also work for your MK2(s)/MK2.5 - have not verified this.
JKSniper made a very nice Noctua fan upgrade for the MK2. The new MK3 is already provided with a Noctua fan by Prusa which is great because the fan is really silent.
However.... that color!!!! Wow...
I guess nowadays Prusa ships with black Noctua fans - at least my 2.5 upgrade came with a black fan - but the early versions of the MK3 were shipped with a very strange "beige-poop-brownish" color...
Anyhow, time for a cover. Due to the new construction / design of printer and extruder, the Noctua extruder cooling fan comes really close to the left Z-rod so there is not much space.Taken the Noctua cover from JKSniper as a starting point I have adapted it to fit the MK3 and such that it does not touch the Z-rod.
You need to take out just two M3 bolts/screws of the Noctua fan (the top and bottom bolts at the front) and leave the rear top and bottom bolts in place. The cover has some notches that will "snap" into the rear bolt heads and the front is kept in place by the M3 bolts - just look at the pictures it should be self explanatory.
I printed the one on the pictures in FormFutura's HD Glass (kind of PETG)
UPDATE 26-12-2017: uploaded Rev2 version. Added some bevels and 0.1 mm width and height to the notches that go into the M3 bolts that remain seated in the extruder/Noctua fan to provide a little more grip. Depending on the material and printer calibration this might work better for you.
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