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.

@BiornVS

2 жыл бұрын

I bet will get less under extrusion and skipping step faster. If you have time for test that 😁

@oleurgast730

2 жыл бұрын

Actually the effect can be even more. I upgraded a prusa mini from stock to BMG feeder. Printing PETG I often got problems with skipping or total blocking. Reason was due to many retractions on the object parts of the filament passed the gears multiple times. The bondtech gears deformed and a bit streched the filament. Only decracing the speed helped... Actually the problems on stock feeder where less (in this scenario, but the BMG behaved a lot better in other scenarios).

@cobeer1768

2 жыл бұрын

Faulty test from jump.

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!

@Vez3D

2 жыл бұрын

I was surprised as well.. but this is a single drive extruder, so...

@danthemancasey

2 жыл бұрын

Time for a "filament slippage compensation" implementation in Klipper!

@specialingu

2 жыл бұрын

@@Vez3D i have wondered, with the new boards that have 8 drivers, could you clone the extruder output, and run 2 extruder steppers and drivers, and have the 2nd extuder at 90degrees to the first, so the teeth bite into every side of the filament... it would suit bowden style fine

@Vez3D

2 жыл бұрын

@@specialingu there are dual drive extruders. I just still didnt upgrade my Voron yet :P

@specialingu

2 жыл бұрын

@@Vez3D yeah I know, I mean 2x dual drive :) that would give you even more shove/pressure before slippage? As the limit is the gear teeth shredding the plastic?

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.

@specialingu

2 жыл бұрын

how come you dont have a copper version?

@nunosantiago6720

2 жыл бұрын

@@specialingu The perfomance improvement wasn't following the cost increase.

@jezclark4882

2 жыл бұрын

@@nunosantiago6720 I'd like to see a Tungsten Carbide version of the CHT (if it's even possible to machine) - great hardness + great thermal conductivity = best of both worlds.

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.

@Vez3D

2 жыл бұрын

Thanks Nero.. I can't wait to test the 1.8 on my Magnum+. I'm not sure the RepRap V6 style nozzle will go away soon...Slice has well explained why they chose to go with on the M+ and it made a lot of sense :) go check Vector 3d last vid interviewing Dan. :) Again thanks for coming to here mate. Have a terrific evening 😊

@specialingu

2 жыл бұрын

one thing im curious about, why bother with brass when you could go straight to copper? unless copper is a right sod to machine the way they need to for this...

@CanuckCreator

2 жыл бұрын

@@specialingu Most likely due to the fact that copper is softer than brass and considering how thin the web is, the extra strength would increase life and making machining it easier. Copper is a PITA to machine

@specialingu

2 жыл бұрын

@@CanuckCreator yeah that makes sense. I guess the ultimate nozzle might be a "phat" revo type with a copper jacket and a brass splitter insert but that might be impossible

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

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?

@Vez3D

2 жыл бұрын

It does

Really fascinating results!

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

Great job and Demonstration Vez 👌🏼

great data thank you Vez. appreciate it!

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.

@Vez3D

2 жыл бұрын

It definately got my attention as well how differently they were pushing plastic.

@76byoung

2 жыл бұрын

He's pushing it so fast the center of the filament isn't melting as fast as the outside so I suspect the fan is hitting at the points of the extruded filament that bend intermittently. Edit: I think that's the reason for the mixing section of the new nozzle.

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.

This is impressive!

nice work TY for sharing

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? 😀

@ameliabuns4058

2 жыл бұрын

Damn that's a great idea. Should we make a feature request? I'll vote if anyone does

@samu2453

2 жыл бұрын

Oh well, that would be awesome!

@dgkimpton

2 жыл бұрын

Came here to make this point... already made - good job :)

@MrMetalWorx

2 жыл бұрын

What would you change though .. higher feed rate leads to slippage so increasing the feed rate to compensate just increases the slippage?

@thiagosannafreiresilva4366

2 жыл бұрын

@@MrMetalWorx could still work if they don't increase at the same rate. Maybe some temperature compensation could be thrown in as well.

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!

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.

@Vez3D

2 жыл бұрын

not realy.. minimum I think. just normal stuff with 3d printer stuff. But maybe it will be better once I fix this

@DoRC

2 жыл бұрын

@@Vez3D okay yeah yours doesn't look as bad as his did I just noticed the wobble so I figured I'd mention it

Great video!

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.

@michaelbrobbel8753

Жыл бұрын

I also have a 0.4 cht that I have not yet tried but that is next on my list

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.

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

@Vez3D

2 жыл бұрын

Haha it's a 1.5

@fallingwater

2 жыл бұрын

@@Vez3D ah, yes, I keep forgetting there's a step between the 0 and the 2.4. One day I will own these. One day...

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. 🤔

@Vez3D

2 жыл бұрын

I don't have a 0.6mm nozzle on the nova sorry

@texasermd1

2 жыл бұрын

@@Vez3D I know. He doesn’t make one but you’d still have requested vs actual extrusion and volumetric flow data.

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

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

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.

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.

@Vez3D

2 жыл бұрын

I'll check

@Vez3D

2 жыл бұрын

Indeed it is a bit yes. Good catch. I'll replace it

@laiquocbao2565

2 жыл бұрын

@@Vez3D Yeah, that minor defect can affect you like an awful lot when doing test like this. Don't know why but after watching the newest vid from CNC kitchen, every gear seems to be off center to me now, lol

@Vez3D

2 жыл бұрын

@@laiquocbao2565 haha yeah I saw it too.

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

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.

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?

@lijgame

2 жыл бұрын

Added an image to demo the under extrusion amount: imgur.com/a/H2HKMfd

@Vez3D

2 жыл бұрын

Sure but that it's at high speed with no stop for 400mm.. I don't see a print where there is not stop or break for the hotend like so.. that's why I think it would be safe to use higher

@lijgame

2 жыл бұрын

@@Vez3D This theory applies to both nozzles here ;)

Verry Interesting!

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

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

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

@Vez3D

2 жыл бұрын

Look on bondtech YT channel. They saw a vid about retraction :) I may do one too

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

@Vez3D

2 жыл бұрын

Its there at the end :)

@BiornVS

2 жыл бұрын

@@Vez3D I was thinking about that too before, real flow / requested flow * 100

@Vez3D

2 жыл бұрын

Sorry Rac I didnt get it at first hehe. ok the % .. good idea. Next time

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

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?

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.

@REDxFROG

2 жыл бұрын

The Prusa Slicer has a flow restriction setting . However faster always means worse. The plastic needs time to bond.

BTW: they now make 0.4mm CHT nozzles.

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

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.

@Vez3D

2 жыл бұрын

this is not meant to replace a volcano :) .. but you can add this to a mosquito Hf to get even more flow.. or a E3D revo.. or anything RR/v6

@carlosperromat3013

2 жыл бұрын

@@Vez3D i see what you mean, but it is marketed as increasing flow. I was wondering if this could be a way to use a regular flow hotend in higher flow situations instead of a volcano or an hf mosquito with comparable flow, but being able to revert to standard flow just by switching the nozzle. If you use a volcano, you end up having trouble if you want to use small nozzles, and this may be a way to get x percent of the performance for the occasional use of a big nozzle without messing with the hotend.

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? ;-)

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!

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.

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?

@Vez3D

2 жыл бұрын

Rrf

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!

@PCR

2 жыл бұрын

RRF has nonlinear extrusion for it ;)

@Vez3D

2 жыл бұрын

@@PCR interesting...

@christianmontagx8461

2 жыл бұрын

@@PCR Thank You!

how was the temp holding in the faster flow rate?

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!

@Vez3D

2 жыл бұрын

you have to keep me posted on this :)

@ameliabuns4058

2 жыл бұрын

@@Vez3D I'm planning on doing it once I escape Iran so it'll be a while before I can actually try it! In the meantime tho I've been tempted to try tpu printed gears

@fuckutube65

2 жыл бұрын

@@ameliabuns4058 TPU printed gears? Oh dear, those will last like what, one print? At least make them from Nylon, which is known to be very abrasion resistant and actually used for gears sometimes!...

@ameliabuns4058

2 жыл бұрын

@@fuckutube65 what are you talking about?

@ameliabuns4058

2 жыл бұрын

@@fuckutube65 it's gonna use it to push filament not as a gear

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...

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

@Vez3D

2 жыл бұрын

sure is !! it will add more flow to your hotend

@specialingu

2 жыл бұрын

melt quality is probably better

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.

@Vez3D

2 жыл бұрын

Thanks for the suggestion. Can you point me where you see blank audio? Im always wanting to improve :) I'm not the best video maker hehe and any recommendation is welcome.

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?

@Vez3D

2 жыл бұрын

With the grove mount

@getrav

2 жыл бұрын

@@Vez3D it just looks so much smaller than the mount that’s on nova’s site!!!

Is a cold pull still good possible?

👍😎

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

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.

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

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

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

@Vez3D

2 жыл бұрын

Yes . MirageC did it. We have talked together about it yesterday and he will add some more math calculation to his filament sensor :) this will be awesome

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

@Vez3D

2 жыл бұрын

It was at 215c when I swapped nozzle. I know why you say so. Because I touch the nozzle with bare hand. Hehe once nozzle is loose you can use fingers to unscrew it...if you don't hold it too long and too hard. I do this all the time. Hot potato game. Dont stay too long or get burnt hehe

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

@Vez3D

2 жыл бұрын

It all depends on the layer height. You can use the tool on 3dpassion where you can buy the nova hotend to calculate speed

@OldCurmudgeon3DP

2 жыл бұрын

Teaching Tech has a calculator on his website.

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

@Vez3D

2 жыл бұрын

on ne peut rien te cacher man

@donny0365

2 жыл бұрын

@Vez3D Je suis ben content d'être tombé sur ta chaîne. Continue ce que tu fait man . C le fun d'avoir un youtuber Qc 3d printing =)

how often do they get clogged with lots of retractions?

@Vez3D

2 жыл бұрын

need to test that.. but Bondtech on their YT channel put a video with a retraction torture.. and it did pretty good

@Vez3D

2 жыл бұрын

dont forget that retraction clogs are happening in the throat.. not in nozzle... unless something carbonized and block the hole.. or a particule is blocking the hole. It wont be any different than a normal nozzle in this case

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

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!

@Vez3D

2 жыл бұрын

Yes I saw it too ☺️

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.

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.

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.

But what is with retracts?

@Vez3D

2 жыл бұрын

Look on bondtech YT channel...they test retract. I might also do a comparaison test too

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

@fuckutube65

2 жыл бұрын

Bondtech is now offering MK8 style CHTs, too, for all you Creality users! ;-)

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

@Vez3D

2 жыл бұрын

what makes you think I did it cold? :P I did it hot... I always do. You can still unscrew them with fingers if you dont hold them too long like I do :) Im not even sure its possible to do it cold without breaking something

@legofreak5769

2 жыл бұрын

@@Vez3D you're a madman lol

@Vez3D

2 жыл бұрын

@@legofreak5769 haha yeah when I burnt my fingers a couple times but once you do master it hehe. You have to be quick and don't leave your fingers too long there

@OldCurmudgeon3DP

2 жыл бұрын

@@Vez3D I figured as much watching the finger movements.

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

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

@Vez3D

Жыл бұрын

Yeah sorry thats what i wanted to say

Looks like there is no point to use both after 19

@Vez3D

2 жыл бұрын

It depends. This is asking constant rate extrusion at high speed. On a normal print...this would translate to a very very long straight line with no pause. In a real world, the extruder will pause ..or slow down at corners..and curves etc.. or even stop for a retract, releasing back pressure..so I think if it's not skipping it's safe to say it would be not bad. But keep in mind this is a bad setup with a bad extruder with single drive gear and a Bowden setup. The goal here was just to compare both nozzles on the same bad setup hehe. And yes ...it really improves flow I think. If I do the same test with a LGX or BMG.. it would be show totally different numbers :)

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

@fuckutube65

2 жыл бұрын

Hey, 15% more is still 15% more, and all it needed was a nozzle change! ;-) People have rebuilt whole printers to get much less than that in increase!...

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

@fuckutube65

2 жыл бұрын

I liked "Mag-numplus" ( 2:11 ) 8)

Ok. Cheap volcano wins ))))

@Vez3D

2 жыл бұрын

these could go on slice hotends or dragons etc... and still improve them. :) I will certainly run them on my Magnum+

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 kzread.info/dash/bejne/o6KD0aZ-adXQZto.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 kzread.info/dash/bejne/enp3z7GfnJbbpJs.html , kzread.info/dash/bejne/hI2bxq6JlcK6YMY.html) or ( length kzread.info/dash/bejne/foCjkpWCeJDKoMY.html perhaps not usable for filament). Nice to watch ,good work.

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?