Gladly I will put it up later today… if you want I can also post my progress on the second version… i was designing it to use Brent’s original part but with a plate that screws into the side and covers the front of the fan, to provide a cleaner look. Up to you, let me know.
Did you find you needed to dial back on your fan settings for say PLA? Ive tested the fan today at 12V and theres some serious airflow! Im just concerned that it might cool the filament too quickly and wondering if you found that you had to make any adjustments?
Yes, on prints that I want to maximize layer adhesion on, but are simple geometries that I don’t worry about bridges or overhangs, then I use part cooling at 20% in the slicer (S3D in my case)
sorry for the delay, here are the parts:Atom’s Blower Mod.zip (2.4 MB)
please excuse the disorderly nature of the CAD work. this was my first time using F360 
2 Likes
Great Mod and thank you all for your efforts!
Im pretty disapointed by the stock part cooling after all this promising advertisement.
Hopefully I would love to recreate your mod, but unfortunatly I´ve also just bare basic knowledge in electronics. I read a little about the flyback diode and comprehend it´s use. But it would be really gread if you could offer some more specs.
Till now I can´t figure out which one I need.
Thanks in advance an keep on going 
1 Like
Welcome!
Nearly any Schottky or small signal diode will work. I used a 1N4148 because I have a drawer of them, there are many others that would work. The idea is the diode has to be fast enough to clamp the voltage. In a pinch I think even 1N400* series would work, but they are a bit slower.
If you have one in mind that’s easy to get message me and we can chat.
1 Like
Nice! Did you mount the holder in between the housing and the left cover, or just replace the cover with the holder?
Sorry, just saw that you already mentioned it before.
No problem, I do think it. Could replace the left cover if you add a vent over the opening… I had planned to do that for my v2
1 Like
Hi Brent,
thanks for your swift response.
I found the 1N4148 diode and will try to clamp it in the JST connector like you did.
First I´ve looked here.
Its a known german vendor for electronic parts, but I was overwhelmed by the possibilities.
If you think it´s the best choice I´ll stay with the 1N4148.
Thanks again;)
1 Like
Nice. It should work. I actually disassembled the jst connector and soldered the diode to it. It’s finicky, but I had a helper.
1 Like
Just wanted to post a quick response here to say that this mod is absolutely amazing and so simple to do!
I will be posting some images here displaying the incredible improvement in overhang print quality in a day or so when I get a chance to take them! In the meantime I can describe the results.
With the stock printhead at 100% fan, I printed an overhang test and there were quality issues with overhangs after 50degrees. With this modded fan configuration at 65% fan, I had near perfect overhang quality all the way up to 70 degrees! I kept all settings other than fan % the same between test prints and printed using the same material with the same part positioning and orientation on the build plate.
TLDR @brent113 your mod is absolute magic!
5 Likes
This looks really cool. For those of us that have no business doing a mod like this (ie can’t quite read wiring diagrams fluently), can anyone post pictures of how they made the Y connector and which direction the diode is wired, and how it’s all connected to the external fan? Brent’s beautiful completed picture is nicely heat shrink wrapped so it’s hard to see, and the sketch gives a very good idea but I’m afraid of frying something!
1 Like
Sorry Its taken me so long to get these images up as a visul representation of the effect of the mod!
This is how @Atom version looks, quite smart in silver pla!
And the effects… I printed an overhang test twice, once with the stock fan at 100% and again with the mod at 50% fan. All other settings were kept the same (layer height, speeds, temps, etc.). Its also worth noting that ambient temp was approx the same as I have fans in my enclosure connected to a temperature controller.
As you can see the stock fan at 100% had quality issues after a 50° whereas the modded fan at only 50% resulted in good quality up to 70°!
7 Likes
that looks great! just out of curiosity did you have to mod my design at all?
I simply cut the model so I could print it without the need for supports! Otherwise the model is exactly the same.
1 Like
That looks awesome… Can I ask you where did you cut the model ? or would it be possible to share the files?
Bottom Corner.stl (315.0 KB) Main.stl (76.0 KB)
These are the parts for atom’s model that I split. Shouldnt require any supports to print.
6 Likes
Thanks for the great comparison pictures. Would I be correct in assuming that the tests you ran used either the stock fan or the Mod Fan, but not both? I’m planning on tying both in based on @brent113’s suggestion, so would a 50% speed for both be a good starting point? Or does anyone have any experience there?
I have all the parts now to make the new fan mounting pieces and the Y-cable. I’ll be working on that shortly.
For those of us who don’t muck with the gcode that much, I know that it’s the M106 code that controls the fan speed, but where should that command go in the gcode of the part since it doesn’t seem to be available via the Luban GUI?
The test using 50%power was using both the modded fan and stock with the y splitter.
I use cura as that allows for fan settings.
1 Like
Did you guys change what layer your fan comes on after this modification? I’ve done the modification and tested different power settings with the fan and anything above 50% so far has been way too much cooling and has resulted in failed prints.
1 Like