[quote=“h60”]I too like to know if that 25mm fan is only to cool the filament as I just created a modification myself too.
This mod attempts to point the airflow more or less directly towards the nozzle, hoping that this will cool the filament right after it has left the nozzle.
I have printed the part tonight but maybe I’ll wait mounting it until I get some more insights on the exact function of the 25mm fan.
Thanks
Erik
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Would you like to share this item ?
nice design!
@lr110: I would be happy to share it but I just found out that it doesn’t fit if you don’t remove the original 25mm fan. Do you mind if I tweak and test the design first? I think in stead of replacing the fan, you need this as extra cooling.
[edit]
I’m back up and running again, fans are now running from their own 12v power source for now.
Sorry for steeling your topic Ari!
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I tested my version of the mod last night but I’m not satisfied by it.
The original idea was to add an additional 25mm fan to the setup but due to a design flaw, it wouldn’t fit. The only solution seemed to tilt the original fan a bit. I noticed that it took much longer for the nozzle to heat up while hanging in mid-air. When I then moved the build plate to it’s home position to start a print, the temperature dropped to 180C, too much cooling!
I then put the original fan back into it’s place (above the rod) and moved the duct more to the left. Heating the nozzle was ok again, 200C was easily reached.
With the additional airflow pointed at the extruded filament, I was hoping for an improvement in print quality (which is already quite good).
To be honest, I didn’t see much improvements. On some areas quality was less then before. My overhangs behave about the same which was the reason I wanted to add more cooling in the first place. Also, printing the first layer was a nightmare as I could not get the filament to stick properly to the build plate.
So for now, I will not share this design as it doesn’t bring anything to the table.
@ronkeli: you did not point the airflow directly to the nozzle or did you?
Finally I added a Fan 30x30 to the Ronkeli’s MOD.
but due width of the fan, I added a part to reach the endstop.
It’s not a perfect MOD for the print area but now my prints are really nice.
@h60: you are cooling the head and in my point of view, it is not good or add some Kapton tape arround the head.
Two things need to be cooled:
No problem at all Erik! The subject is still the same and besides we might end up with something phenomenal when combining our designs! Or better, we might learn something! 
The intention of my design is to cool down the last layer of the print while cooling the nozzle as less as possible. I want to print very small pieces ocassionally and resting causes stringing, thus faster cooling might allow printing without resting.
Ideal solution might be to have a circular exhaust around the nozzle blowing outwards of the nozzle. I have seen such designs but there might not be enough space in Vertex.
I’m now (while sitting in a car) figuring out of putting a bigger fan and a duct that has secondary exhausts so that it will give some air to the isolator as well… We’ll see if that never sees a daylight
Keep on inventing!!