Re: Extruder fan specification ?
Allright, you got me. Downloaded and starting to print. And ordered the fan. Actually two fans, for two MK2 extruders. Damn.
So does that mean you are doing a comparison between the 2 different models of fan adapters?
Re: Extruder fan specification ?
No, I've got two printers with MK2 heads, so I need to make the upgrade twice.
But your idea is quite good, I can make one adapter of each design and compare them, if it should be useful for anyone.
BTW your design, when downloaded as STL from Tinkercad, has bunch of errors and can't be sliced just as-is, I had to repair it using Netfabb first.
Re: Extruder fan specification ?
No, I've got two printers with MK2 heads, so I need to make the upgrade twice.
But your idea is quite good, I can make one adapter of each design and compare them, if it should be useful for anyone.
BTW your design, when downloaded as STL from Tinkercad, has bunch of errors and can't be sliced just as-is, I had to repair it using Netfabb first.
I had no problems slicing it in Simplify3D and printing it as is.
Re: Extruder fan specification ?
Try Slic3r. It complains about 25000 errors and sliced model has errors starting at layers Z=22mm when sliced with layer height 0.2mm.
It should work with Slic3r without errors since most of users will use it by default.
Re: Extruder fan specification ?
As a test, I downloaded it and sliced with KISS
There was a minor issue on one edge, but it sliced perfectly
Peter
Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…
Re: Extruder fan specification ?
Finally mounted my design of the duct, I still have some cable routing work to be done "behind" it but MAN its quiet!
Suddenly I hear all kinds of noises from my LED-ramp, spool holder on the wall etc! hehe
Re: Extruder fan specification ?
From what I saw of the design, I routed my fan cable above the adapter. It looks as though you routed your cable to the left side of the adapter. I think there may be some clearance issues if it is not routed up top, not to mention the added length of routing it to the right side.
Re: Extruder fan specification ?
From what I saw of the design, I routed my fan cable above the adapter. It looks as though you routed your cable to the left side of the adapter. I think there may be some clearance issues if it is not routed up top, not to mention the added length of routing it to the right side.
Yes I have some clearance issues when homing the X axis, I'll add a small thingy to the extruder body atm, to stop the carriage a few mm earlier, and we'll see if I reroute the cable, I could just turn the fan and route it on top as well. But MAN its quiet! 🙂
Re: Extruder fan specification ?
If I just secure it with some glue onto the adapter, I have no clearance issues it seems.
My wife suddenly approved printing while watching tv! Thats a great success 😀
Re: Extruder fan specification ?
Congratulations. 🙂 I'm currently waiting for delivery of my fans. I really can't wait to test it.
Re: Extruder fan specification ?
New fans arrived and one printer upgraded.
Well, it works. And it's quiet. It's so quiet that I first thought it was not working. 😉
But ... damn it's so quiet that now I can hear whole new set of freaky and annoying sounds I couldn't hear before. Noise of linear bearings, rattling and whining sound of front cooling fan (bearings gone probably), each single step of Z motors doing mesh bed leveling ... I actually don't know what situation is better. 👿 😆
Besides of that, I feel it doesn't provide the same amount of cooling as original fan. No problems with printing so far, that's true, but for example when nozzle heating is turned off, nozzle cools down much more slowly than before. Can you see it as well?
Re: Extruder fan specification ?
New fans arrived and one printer upgraded.
Well, it works. And it's quiet. It's so quiet that I first thought it was not working. 😉
But ... damn it's so quiet that now I can hear whole new set of freaky and annoying sounds I couldn't hear before. Noise of linear bearings, rattling and whining sound of front cooling fan (bearings gone probably), each single step of Z motors doing mesh bed leveling ... I actually don't know what situation is better. 👿 😆
Besides of that, I feel it doesn't provide the same amount of cooling as original fan. No problems with printing so far, that's true, but for example when nozzle heating is turned off, nozzle cools down much more slowly than before. Can you see it as well?
I know for me, I have a replacement Y-motor-mount installed so I can have a NEMA damper there and on the X axis. There are times I don't know my printer is running when it is. For the Linear bearing noises, I've replaced them with SKF LBBR 8-2LS bearings on the Y-axis and I'm about to do the same for the X-axis (it is starting to rattle too).
As for cooling: I've run a a couple 48 hour print with this new fan setup and encountered no failed prints. Since you have 2 printers, you could go ahead and heat them both up at the same time, one with a 30mm fan, one with a 40mm fan, then set both to cool down and compare the difference temp-wise. Same goes for the 2 different 40mm adapter models.
Re: Extruder fan specification ?
Yeah I know, I even hear the filament "touching" the inner sides of the spool, super annoying.. need to design a guide for that as well, and my led-lights are making a strange rattling in the holder I designed, need to add some damping tape there. But it looks pretty magic when it prints, super quiet really!
YES I think that I've seen the cool down time increased as well, but I don't know for sure, I didn't really think about it before. And I've printed 30 hours after installation without any issues, mostly 240 degrees PETG. In theory the cooling effect should be worse, I did try to "feel" how much the 30x30mm fan moved before cutting the cables and installing the new one, and the small one didn't really move too much air either, it just sounded like it did 😀
Re: Extruder fan specification ?
New fans arrived and one printer upgraded.
Well, it works. And it's quiet. It's so quiet that I first thought it was not working. 😉
But ... damn it's so quiet that now I can hear whole new set of freaky and annoying sounds I couldn't hear before. Noise of linear bearings, rattling and whining sound of front cooling fan (bearings gone probably), each single step of Z motors doing mesh bed leveling ... I actually don't know what situation is better. 👿 😆
Besides of that, I feel it doesn't provide the same amount of cooling as original fan. No problems with printing so far, that's true, but for example when nozzle heating is turned off, nozzle cools down much more slowly than before. Can you see it as well?
I know for me, I have a replacement Y-motor-mount installed so I can have a NEMA damper there and on the X axis. There are times I don't know my printer is running when it is. For the Linear bearing noises, I've replaced them with SKF LBBR 8-2LS bearings on the Y-axis and I'm about to do the same for the X-axis (it is starting to rattle too).
As for cooling: I've run a a couple 48 hour print with this new fan setup and encountered no failed prints. Since you have 2 printers, you could go ahead and heat them both up at the same time, one with a 30mm fan, one with a 40mm fan, then set both to cool down and compare the difference temp-wise. Same goes for the 2 different 40mm adapter models.
A Cool down test would be interested if David has two printers (lucky him)!
I spoke to my brother, who works as a rocket scientist and has done a lot of CFD calculations and simulations when I was designing this, and he thought that related to air-flow and resistance, it would be so small differences between the original setup and this "angled" fan adapter that it would be hard and pointless to even let computers to work on it (I tried to force him into do a fancy CFD visualization on it). So I don't think our adapters is affecting the cooling, but the fan itself could.
Re: Extruder fan specification ?
Since you have 2 printers, you could go ahead and heat them both up at the same time, one with a 30mm fan, one with a 40mm fan, then set both to cool down and compare the difference temp-wise. Same goes for the 2 different 40mm adapter models.
That's brilliant idea, I'm jealous it haven't come in my mind actually. 😳
Preheating both printers, standby...
Re: Extruder fan specification ?
Test done. Test conditions:
Both printers preheated to PLA (210/55), extruders homed and moved to X=10, Y=200, Z=50. Both printers in the same room, room temperature 23°C. Heaters turned off on both printers at the same time. Measured time until hotend fan went off.
Original fan extruder cooled down in 6m46s. Noctua fan extruder was at 69°C at the same moment.
Noctua fan extruder cooled down in 9m12s.
Re: Extruder fan specification ?
Test done. Test conditions:
Both printers preheated to PLA (210/55), extruders homed and moved to X=10, Y=200, Z=50. Both printers in the same room, room temperature 23°C. Heaters turned off on both printers at the same time. Measured time until hotend fan went off.
Original fan extruder cooled down in 6m46s. Noctua fan extruder was at 69°C at the same moment.
Noctua fan extruder cooled down in 9m12s.
I'd be curious if there was a cool down time difference between the 2 different models of adapters. Also, you should probably swap the fans as a sort of "control". to eliminate one hot end being more efficient than the other.
Re: Extruder fan specification ?
I'd be curious if there was a cool down time difference between the 2 different models of adapters. Also, you should probably swap the fans as a sort of "control". to eliminate one hot end being more efficient than the other.
I'm going to do this test as soon as I print your adapter. I haven't printed it yet, I trusted Patrik's design more as it uses screws on both sides, no offense. 🙂
No need to swap fans since I'm going to test it on the same printer with the same fan.
I hope I will be able to do this test until end of the week.
Re: Extruder fan specification ?
Test done. Test conditions:
Both printers preheated to PLA (210/55), extruders homed and moved to X=10, Y=200, Z=50. Both printers in the same room, room temperature 23°C. Heaters turned off on both printers at the same time. Measured time until hotend fan went off.
Original fan extruder cooled down in 6m46s. Noctua fan extruder was at 69°C at the same moment.
Noctua fan extruder cooled down in 9m12s.
OK, thats cool! (hehe)
19 degrees "after".. that last degrees will be the slowest ones, so I would say that is pretty ok and pretty close to the original fan in comparison.
It would be nice to see the result if we could double the speed of the Noctua fan. Totally unnecessary though, since no one of us has got any problems after upgrade. Lets see what a long term test says!
I'm working on a small revision on my adapter, with some added features to simplify the cable routing. And I can also see a small gap between the adapter and the Noctua fan because of the rubber "feets" of the Noctua. I can feel a gentle breeze there so I've added a small flange there to prevent that. Will upload that to thingiverse as well when its printed, tested and considered done. At the moment there are soo much in line though, and since it works as it should now it has low priority. Damn I really need another printer 😀
Re: Extruder fan specification ?
Test done. Test conditions:
Both printers preheated to PLA (210/55), extruders homed and moved to X=10, Y=200, Z=50. Both printers in the same room, room temperature 23°C. Heaters turned off on both printers at the same time. Measured time until hotend fan went off.
Original fan extruder cooled down in 6m46s. Noctua fan extruder was at 69°C at the same moment.
Noctua fan extruder cooled down in 9m12s.
OK, thats cool! (hehe)
19 degrees "after".. that last degrees will be the slowest ones, so I would say that is pretty ok and pretty close to the original fan in comparison.
It would be nice to see the result if we could double the speed of the Noctua fan. Totally unnecessary though, since no one of us has got any problems after upgrade. Lets see what a long term test says!
I'm working on a small revision on my adapter, with some added features to simplify the cable routing. And I can also see a small gap between the adapter and the Noctua fan because of the rubber "feets" of the Noctua. I can feel a gentle breeze there so I've added a small flange there to prevent that. Will upload that to thingiverse as well when its printed, tested and considered done. At the moment there are soo much in line though, and since it works as it should now it has low priority. Damn I really need another printer 😀
One other potential improvement I could see to your design is to have the wind tunnel being a sleeve to eliminate the wind resistance of the internal screw holes.