BondTech CHT Nozzles Flow test. Do they work? 

Keep in mind that this test was done on a Bowden setup with a single drive extruder. There is way more filament slippage than a dual drive. So I expect way better result on a BMG/hextrudort or LGX extruder. Specially in a direct drive setup.

Great job brother! Love the way you have done that test; simple, clear and easy for anybody to repeat at home with their own setup. I am surprise to see how much filament does not get processed even in the low flow rates :O. Will keep an eye on that, thank you!

Great video Vez! Very informative. The lack of the 0.4mm size at launch was because CHT is supposed to be a high flow nozzle, and 0.4 is not for that at all. It also requires very high speeds to use it to the limits. We listen to the market and we will have the 0.4mm available soon. Abrasive resistant later this year we hope. As people may know we have a partnership agreement with 3DSolex and we are using their patent under license. This was not created by Bondtech but we did recognized the value of this inovation and finally is out there for us all to use.

Nice to see the actual charts for this, i spent my latest live stream playing around with these and just ran higher and higher flow prints till they maxed out. But they do deliver on what they claim, which was great to see. Really the only downside is no sub .6mm nozzles and the fact abrasives are a complete nogo. BT claim coldpulls work find but ive yet to test that either. I can see this being one of the "last hurrahs" out of the v6 nozzle/hotend style ecosystem. The 1.8mm nozzle is stupid fun and the .6 will be installed in my tallboi going forward.

Thanks for testing this. One thing that *REALLY* caught my attention was the difference in output starting at 9:44. The regular nozzle making wide loops while the CHT makes a tight stack tells me that the regular nozzle isn't putting as much heat into the plastic, so, as it cools in the air, it is less flexible and thus can't make tighter bends. What that *should* mean in practice when using the CHT is that the plastic will not only flow and stick better, but won't 'tug' on the nozzle at high speeds. Does that make sense?

No views and three likes, you love to see it! You're doing great work on this channel!

Really fascinating results!

The filament in the old nozzle seems to behave as if there are cooler spots in the extruded filament the way it moves around before falling, instead of just flowing straight down.

this it denominal to see how CHT extruded into a small tower!! sooo even unlike other nozzle!!! DAMMMM!!! I'm sold

Great job Vez. Watching the side by side extrusion I really wanted to see an infrared scan of what the actual filament temperatures were. The dramatic difference in the filament piles is telling us something.

So if I'm not mistaken here, this technology is purely to increase contact surface area which improves melt time increasing flow rate while creating additional obstruction to the nozzel. Essentially you get faster melt time which increases flow rate but with obstructions that reduces flow rate and makes it harder to unblock. This is compared to what everyone else did, which was to just make the nozzel longer to increase (surface contact and thus) flow rate without extra complications or expenses. In short, this nozzel is great if you need to maximize performance in tight spaces, but it's not going to outperform a longer nozzel.

Gives you the potential for a (pre-stage melt) before it hits the final nozzle diameter. You will need a 24v system and a higher wattage heater to fully take advantage of this. But this will work best for nozzles .5 and bigger. Love this outside-the-box thinking on where to gain some headroom! Well done bondtech! LOOK at those steppers!! I want to see you do a closed-loop mod! Looking for missed steps as your pushing the bananas out of it!

Very nice. I would like to see you put the Nova back on and run the exact same tests to show where it falls in comparison. Just for fun. Not apples to apples obviously but that Nova.... yeah. 🤔

The pattern is so consistent I am surprised we don't have a speed compensation parameter to tune on the firmware (maybe we do and I don't know about it)? Has anyone showed this to the Klipper developer? 😀

Interesting video as always 👍 Great that you had some history of the nozzle's too👍☺️

Great info and testing! You should upgrade that machine to an LGX and retry the tests.

Great video very informative thank you. I thought I would share my experience. I went from standard 0.4mm nozzle on my ender 3 pro where my best reliable print speed in cura slicer was 60mm per minute. I put on a cht 0.6mm nozzle and was able to comfortably print with similar quality at 125mm per minute. I printed the same part on each setup. The 0.4 nozzle at 0.2 layer and the cht 0.6 nozzle at 0.3 layer. The print took 17 hours 23 minutes on the 0.4 and 6 hours 7 minutes on the cht 0.6. Both prints of similar quality. That to me spells results.

This is impressive!

I have similar results with the 0.6 CHT. I can push 37cmm/s while with standard nozzle I could push 20, 24cmm/s at best on a Titan Aero with flow rate compensation.

great data thank you Vez. appreciate it!

I'd be curious to see if CHT nozzles reduce internal stresses since it seems to more homogenously heat the filament. I'd assume that would theoretically mean less warping, especially after annealing.

Great job and Demonstration Vez 👌🏼

I designed an extruder idler assembly very similar to what your machine has and through moving things around in CAD noticed if you add a screw to preload the spring just below the actual load you tweak it to. Eliminates one source of potential skipping but trades it for a source of vibration when it would otherwise skip. I opted for the vibration route since that is counterable by tweaking other settings.

You know you're a 3D printing badass when a Voron 2.4 is your slow printer

Don't know if it is due to the optical illusion or not but the extruder gear's rotation at 6:55 seems to show that your extruder gear is machined off center just a little bit.

3 more questions: Is adding 3 holes the same as extending the meltzone (e.g. compare volcano)? Is surface area the limiting factor in flow rate? Does forcing the core of the filament to split and therefore heat beneficial in any way (flow, quality)? Another way to put the last question: how does the temperature gradient across the filament cross section impact printing?

Thanks for the test, it's very interesting and informative! I noticed an issue though, you mentioned you are comfortable at 19mm^3/s for the standard nozzle and 27 mm^3/s for the CHT nozzle in the video because you don't want to see too much under extrusion in actual printing(very good point!). But according to the curve you get, CHT nozzle will under extrude more start from about 21.5 mm^3/s onwards. I think the comfortable points for each nozzle should be 19 mm^3/s and 21.5 mm^3/s instead?

Do you have any strange z inconsistency issues on that printer? I'm asking cuz I noticed that the extrusion gear is off center and CNC kitchen just put up a video where he was having issues with the printer and the off center hole in the extrusion gear was causing uneven extrusion.

Nice results! Could you make a follow up test comparing retractions? My intuition says that retractions should be worse because of the splitter.

The deviation between requested/actual flow was pretty much my main roadblock when trying to go faster. Sure, it'll still print, but at some point the quality really starts suffering from under extrusion. I'm not sure if you could compensate for this in software or just have to pick a nozzle/temperature combo with a little under extrusion.

Watch at 6:45 - CNC kitchen just did a video on a similar extruder where his gear was out of round. Looks like yours is as well! May want to explore that if you ever see inconsistent extrusion. Cheers!

More even heat distribution through the substrate = better flow. There'll come a limit to how much more performance can be achieved in this method by looking at the viscosity characteristics of the individual heated polymers. The hole sizes can't get any smaller than pi * sheer boundry^2, so that really defines how much you can redistribute heat better using this method of splitting flow.

nice work TY for sharing

Would be an interesting developement: A flow correction feature for a slicer, there you make a test of 5 volume speeds measuring the lack of extrusion, the slicer than calculates the trendline and instead of traditional calculating the extrusion lenghs it calculates the lengh realy needed for the speed to actual get the volume needed. Of course never use speed setings of the printer, because if you reduce speed there you would get over extrusion. Such a correction might be possible in the firmware also - but as the effect might highly depend on the filament you use, you would need an autocalibration there. Maybe an encoder measuring the amound of filament realy is pulled into the feeder...

i use 400mm when doing esteps as well. one time i accidentally did 200 and noticed i was off so i figured why not more? it seems to make a positive difference. i go overboard when pid tuning as well but it seems to help

Hi what kind of gloves are you wearing on 1:12?? nice video! i already bought one CHT nozzle thanks to your review! :)

I'm making an extruder that uses neoprene belts/rollers to push Filament to not leave any marks for this reason! No bite gears just you know, friction!

Thank you, good job. I would love to see a comparison between this and a volcano or other high flow system, to see whether this could be a usable alternative without the hassle. It would also be nice to see a comparison in stringing.

Thanks for your tests, It was certainly interesting (and important!) to see the difference a simple nozzle change makes in a standard widespread V6 (CHT has MK8 CHTs now, too, so that would warrant another test run for sure, just think of the sheer volume of MK8 printers out there, e.g. all the Creality ones!). I can't help wondering though how much the melt rate of the hotend and the printing temp factors in here, cause as we all know a hotend can only melt a certain amount (which is why they made the Volcano and Super Volcano!)... Also: Maybe you can do another test run at 230C to see if that changes anything? ;-)

Awesome test! Now i can just wish they make a supervolcano one 😀

Be great if you could test trianglelab plated copper nozzles and maybe copper heat block. Also keep an eye on Trianglelab Rapido Hotend Pringtng flow up to 75mm³ Just saw that today looks pretty cool!

Great video! What about retractions? Does this filament path affect stringing?

BTW: they now make 0.4mm CHT nozzles.

Awesome video as always! I would recommend to show the percentage of relative extrusion by requested extrusion for an easier visualisation

Looking at the result: Is there a way to compensate the underextrusion by software? Is it even nessessary to compensate on higher speeds and mm2/s? Good video by the way!

great video and anaology easy and understandable. but future improve for you to cut the blank audio. where idling. it make video short and compact full of information.

My bowden (cr10s pro v2) can do at least 40 mm^3 with a 1.2 nozzle very well, less with smaller ones. Bed slinger can't go faster with acceptable quality to push it (100, absolute max 120mm). But I also have the full copper block. After upgrade from aluminium I had to reduce ESUN PLA+ down to 190-195 degree from 215 degree for good results, got too hot despite hero me dual fans upgrade. Will now upgade x,y axis to linear rails, wheels turned out to be unreliable. After a while something breaks, like waves in first layers because wheels started to develop dirt/bumps or simple untightened themselves.

Great video!

6:50 wow that gear is wobbly. I guess bowden setup saves you from visible inconsistent extrusion? (Stephan did a video about it)

6:45 that one is not exactly running around the middle

Nice comparison. I'm curious how they compare to copper nozzles.

Can you still do a cold pull with these? Is there more material left in the nossle during a filament change? Or any other downsides to the design?

i have a Phaetus Dragon High Flow, I wonder how much the CHT would increase the flow :o

Verry Interesting!

As I read the last graph the CHT is able to push out 25mm³ but you have to set it to 28mm³ so you would have to adjust to set the flow to 112%. But I don't know if this would lead to overextrusions on parts of the print where the max speed cannot be reached because of slow acceleration. Is there any firmware, that is able to automatically adjust the flowrate non-linearly to the current print-speed?

Noticed that you change nozzles without heat on the extruder... I damaged my threads on a Mk7 this way

I love your videos, and this one is no exception. BUT, it seems to me that something is very wrong here. I have performed these same tests on my stock Ender 7 and I hit 18-19mm^3/s at 5% under-extrusion, 19-20mm^3/s for 10%, and it falls hard (20%-40%) at 23-24mm^3/s at 230-235 degrees with eSun PLA Pro (PLA+) on the factory 0.4 nozzle. Extruder starts audibly slipping at 23^3/s and consistently slips at 24mm^3/s. Why is this underextruding at 10mm^3/s and basically unusable for a quality print (my personal standard for this is 10%) by 12mm^3/s? Something feels off here. Way off.

Bowden + single gear doesnt do justice for CHT. Please make a new video for CHT flowrate test. Most of cht users are direct drive with dual gear.

In the past you would bump temp to squeeze out more flow, does this affect results in a meaningful way?

Now you should test retractions, pressure advance, flexible fillaments and make other calibrations. This nozzle might be not as good at these tests as at max flow test.

how was the temp holding in the faster flow rate?

you should be changing the nozzle while the end is hot. thats a good way to break off a nozzle in the hotend or a leaky new nozzle

I have a nova hotend also but I’m not sure how to mount it to the Voron properly. Can you share how to do that?

easily replicated with standard nozzle, one at 180c and the other a 220c, same result man.

Is there any advantage to using one of these nozzles in a (near) stock hotend?

They're Nickel-plated, not Zinc-plated. ;)

lets 3d print metal nozzles with optimal porosity then. This old "drilling" 3 holes thing is ancient.

How fast can you print with this 0,6mm? 28mm3 is how fast?

Does anyone put an encode on a filament sensor and close a servo loop on it?

how often do they get clogged with lots of retractions?

You have a slight accent I recognize, are you by any chance from Quebec?

👍😎

Looks like there is no point to use both after 19

But what is with retracts?

I tested these nozzles (0.6) on a dragon hotend (high flow) and only get 15% more flow. Kind of disappointed.

Hi has anyone use this nozzle with Ender 3 Max? Seems that it requires a hotend

For some reason I got trigger by your pronounciation of Voron.

Ok. Cheap volcano wins ))))

your work is good, so why dont invent a own nozzle with heat-elements directly integrated at the end of the nozzle. Then a very-good insulator (e.g airogel ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-qnOoDE9rj6w.html) around the nozzle, and then pump e.g. compressed air (cold air) directly around the nozzle to instantly cool the filament down to reach even higher speeds ? Great work your doing. Also you showed that its important to know the length/thickness of the filament feeded, also invent a own device :) (which would be best at least :) ) or use ready devices like e.g. (diameter ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-HFCmOfl3ut8.html , ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-RYgdLPe_T0c.html) or ( length ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-LLo03IH-dpc.html perhaps not usable for filament). Nice to watch ,good work.

You should try to estimate the heat demand to raise different flow rates of plastic to 250 C and melt it. If the better nozzle improves heat transfer, then these higher flow rates might be able to make use of more heat than your heater is currently able to provide. ISTM this indicates that to push to really high flow rates you are really up against the heat transfer characteristics of the plastic and you might be better off having multiple melting chambers feeding into one nozzle, filament preheating or other ways to improve the situation.

Is a cold pull still good possible?