Prusa i3 MK3 Cooling fan Nozzle / Shroud

thingiverse

Here's a remix of two parts: the original cooling fan nozzle provided by Prusa and the MK3 Surround Shroud designed by Codiac2600. My original nozzle was severely skewed after months of use, so I had to replace it (see pictures - apparently it couldn't withstand the heat). There are many designs available, and I've tried several of them, including the referenced nozzle as designed by Codiac2600. This nozzle design didn't quite work for me, but I got better print results with the original nozzle/shroud combination. However, I did like the solution Codiac2600 came up with - a vertical tab that supports the nozzle between the extruder body and the cooling fan. The reason I liked this solution is because the original Prusa cooling nozzle is attached by only one M3 bolt/screw, which can cause it to hang slightly to one side. So, I merged the two designs together and ended up tweaking them quite a bit. I lengthened the original nozzle by a few millimeters so that it just doesn't touch the PINDA probe while potentially increasing airflow to the rear. I also made various changes to improve print quality, fit the nozzle around the fan better, revised the vertical tab so that you can attach it with three bolts/screws, added "in model" supports, and more. After many iterations, this design now works reasonably well for me (at minimum as good as the original nozzle). However, I still feel that overall cooling on Prusa's is not optimal since it doesn't cool 360 degrees. Playing around with water can give you an idea of the airflow of this design, and it seems to work as intended - see photo.