Prusa i3 MK3 Cooling fan Nozzle / Shroud

cults3d

I've taken two parts, the original cooling fan nozzle provided by Prusa and the MK3 Surround Shroud made by Codiac2600, and remixed them. My original nozzle had become severely skewed after months of use and needed replacement (you can see pictures showing its condition). Apparently, it couldn't withstand the heat. I've tried several designs, including the referenced nozzle designed by Codiac2600, but it didn't quite work for me and I ended up with better print results using the original nozzle/shroud combination. However, I did appreciate Codiac2600's solution of supporting the nozzle with a vertical tab positioned between the extruder body and the cooling fan. This was because the original Prusa cooling nozzle is attached by only one M3 bolt/screw, which sometimes left it hanging slightly to one side. So, I merged the two designs together and ended up making several adjustments. I lengthened the original nozzle a few millimeters so that it just wouldn't touch the PINDA probe yet potentially increase airflow towards the rear. I also made various changes to improve printing quality, better fit around the fan, revised the vertical tab for attachment with three bolts/screws, added in-model supports, and more. After many iterations, this design now works reasonably well for me (at a minimum as good as the original nozzle). However, I still feel that Prusa's cooling system isn't optimal since it doesn't cool 360 degrees. You can get an idea of airflow by playing with water; my design seems to work as intended - see photo.