12/27/2022 0 Comments Hemera disassemblyI agree with Danny, it's very difficult to assess issues people are having based on forum discussions, we often find that people jump on the bandwagon with unrelated issues and assume that their issue is automatically a product fault. Whilst the issue may not be widespread, it's certainly not isolated. I'm by no means a novice printer, in fact I got into the game quite early so have been around the block. Without being pedantic if the number of people posting about the issue on this forum scale up to open support tickets I'd expect there to be a few more than 10. I'm on 24v but using a converter for the Noctuas so it wouldn't be an issue either way. I will not be putting the Stock fan back on but would be tempted to have a go with one of the Sunons you are using. Sufficed to say it's for educational purposes only. I will have to do some testing and put a thermocouple on the h/s to see how each actually affects the cooling. I do get your point however that although Airflow is better 9.4 v's 5.32 the Static pressure is indeed 2.26 V's 2.94. I have the "H" model right in front of me (ironically stock oem on my printer before the hemera) and the model supplied with Hemera is not the same. Those who are happy and have no issues simply don't post anything, and I am certain there is thousands of them. Don't you think there would be thousands of threads if it was a common issue? That is the definition of vocal minority. Consider how many people are using the Hemera now. I would also like to point out that while it is the "biggest issue in this forum", there is only maybe like 10 threads of so. You will probably get like half the airflow with it than with stock. Noctua however is absolutely inadequate in every regard. We can get very close, but it is impossible to get that good of an air flow without lots of noise. So no, none of our fans are better than stock. I hope that you see where the issue lies, and why Noctua is inadequate. The lower it is, the more it means any sort of obstruction (Hemera's heatsink) will reduce the airflow. If all of this is valid, then the stock fan pushes 11.92 m3/h at 4.51 mmH2O static pressure (still even higher pressure than my Sunon!) There is no way that the slower "M" fans would be this loud. Direct dBA noise level comparisons would point to this as well. This makes me believe that the stock fans are actually XYJ12B4010H. They are labeled as XYJ12B4010M, but a Sunon fan of equivalent specs is much much weaker (I have bought an "M" equivalent Sunon at first, and then realized it blows like, 2x less air when holding a hand against it). While there is still no official data, I have managed to dig up this data sheet for the stock fans: My tests have shown that the stock Hemera fans are possibly mislabeled. In comparison, the Sunon fan I linked pushes 13.01 m3/h with 4.21 mmH2O static pressure. It pushes 9.4 m3/h with 2.26 mmH2O static pressure. If you would look at the specifications, you would realize that the strongest 4020 Noctua fan ( ) is extremely weak. I've been 3D printing for longer than most I suspect and this is a battle I'm not winning. I'm chasing my tail and I'm all out of ideas. Oiling works and has allowed me to complete several TPU prints. Sometimes after a few layers, frustratingly sometimes after 1-2 hrs. With every TPU it's the same, starts off well and goes to hell at some point. Some pretty extensive testing and many hours/days lost. Sliced with Simplif圓D, Prusa Slic3r, Cura. Ran every TPU I have tried at assorted print speeds from 20mm/s to 60mm/s.Įdited my profiles endlessly ( I have several printers with working TPU profiles so not a novice). Ran every TPU I have tried with every part cooling fan speed from 0 to 100% including kicking in at assorted layer heights. Ran every TPU I have tried at at 0 to 1.5 retraction. Ran every TPU I have tried across a range of temperatures. Used cleaning filament to ensure no residual inclusions in hotend. Ran with printers stock fan (this is going from memory, forgive me any innacuracies) which shifted around 7 CFU, Hemera supplied fan which I think shifts 8.5 CFU and 40x40x20 upgraded fan which shifts approx 10.5 CFU. Have now tuned the vref (only done this out of desperation as it was working fine, no skipping or overheating) To collate the things I have tried and changed to date.Ĭan print other filaments fine and dandy, so for the most part setup is verified.Ĭalibrated esteps and extrusion to within a fraction of a MM There seems to be a problem thats widely observed and that is not being addressed.
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