Volcano is Dead, long Live Volcano! DIY High Flow Adapter
Vložit
- čas přidán 19. 06. 2024
- Start your free trial at squarespace.com/cnckitchen and use code CNCKITCHEN to get 10% off your first purchase.
The Volcano hotend is obsolete - is what I said after testing Bondtechs CHT High Flow nozzle. But what if I told you that you can use a standard length CHT nozzle in your Volcano hotend with a DIY adapter. I’ll show you how I made a simple one with a single bore and a high-flow version with three individual bores and test how much more performance you can expect with this method! Let’s find out more!
Buy a Volcano Adapter in our Store: cnckitchen.store/products/vol...
Website article: www.cnckitchen.com/blog/nozzl...
Visit my online Store: cnckitchen.store/
💚 Support me 💚
Patreon: / cnckitchen
Join as a CZcams member!
CNC Kitchen Threaded Inserts: geni.us/CNCKInsertsChoice
Merch: teespring.com/stores/cnckitchen
Buy an Original Prusa i3 printer: geni.us/CNCKPrusa
PayPal: www.paypal.me/CNCKitchen
Shop at Matterhackers(US): www.matterhackers.com/?aff=7479
Shop at 3DJake(EU): geni.us/zHvnB
Shop at E3D: geni.us/CNCK_E3D
🎙Check out The Meltzone Podcast: / @themeltzone
🛒 Equipment used in this video:
CHT Nozzle - V6 Compatible (Affiliate in DE/UK): geni.us/U6M8s1K
CHT Nozzle - Mk8 for Ender 3 and similar (Affiliate in DE/UK): geni.us/OevmhbU
E3D Toolchanger (Affiliate): geni.us/E3DToolchanger
E3D Hemera Extruder (Affiliate): geni.us/CNCK_E3DHemera
Set of brass grub screws (Affiliate): geni.us/0A4L
Longer M6x16 mm grub screws (Affiliate): geni.us/kSzQc
Torque Wrench Screw driver (Affiliate): geni.us/WLCs
🎥 Related videos:
How does extrusion temperature influence flow: • How fast can your hote...
High-flow testing on the VORON 0: • High Speed Printing: H...
DIY High Flow Nozzle: • My High Flow Nozzle is...
Bondtech CHT Review: • Does This make Volcano...
DIY nozzle on Mini Lathe: • Mini Lathe Project: 3D...
📖 Further Links & References:
Core Heating Patent: worldwide.espacenet.com/paten...
⚙ My gear (Affiliate Links):
🎥 CAMERAS & LENSES
Panasonic GH5 - Professional 4k60 camera: geni.us/LMN0CmS
Panasonic GX80/GX85 - Great value system camera: geni.us/M2Sm
30mm f2.8 macro - Great Macro Lens (80% of my videos): geni.us/vEwqD
10-25mm f1.7 - Awesome Lens: geni.us/ZTBH
12-35mm f2.6 - Great Allround Lens: geni.us/S9GOsr
14-140mm f3.5-5.6 - My go-to travel Lens: geni.us/fSAyKo
25mm f1.4 - Nice prime for photography: geni.us/mqWM
🎙AUDIO
Rode Video Mic Pro - Shotgun mic: geni.us/6JFRdJ
Rode Film Maker Kit - Wireless mic: geni.us/XMD2N
Rode NT-USB - Studio Mic: geni.us/YVONvy
🔴 LIVE STREAMING
Elgatoo Stream Deck: geni.us/ppIiAL
Elgatoo HDMI USB Capture Card: geni.us/imhD
Logitech C920 - Overhead camera: geni.us/ViVgB
Follow me on Twitter: / cnc_kitchen
Follow me on Instagram: / cnckitchenyt
Chapters
00:00 Introduction
01:55 Volcano Adapters
03:41 Making a Simple Spacer
04:31 Making a High Flow Spacer
06:05 Sponsor Integration
07:20 Testing the Spacers
12:40 Flow-adjusted Results
14:56 Summary & Conclusion
DISCLAIMER: This video was sponsored by Squarespace. - Věda a technologie
Volcano is Dead, Long Live Volcano!?
:O
I think one of the newer HF hotends with melting zone integrated in the heatsink like the Mosquito or Dragon with a CHT nozzle would be another interesting test.
It's quite a bit more compact compared to the long Volcano block and probably has some other benefits as well.
Nope. I want to print Carbon-Fiber and Glass-Fiber reinforced fillaments, and I want to print them fast, but there's no hardened steel CHT nozzle and, probably, never will be.
What about 3 extruders feeding 3 filaments into one nozzle like the colormix nozzle but for speed not colormixing?
I have an idea you could convert a CHT nozzle into the spacer (remove the hex and tip and cut treads) and then use a shortened volcano nozzle.
I'm wondering, does this "high flow spacer" actually completely circumvent the CHT nozzle patent, considering it's not a _nozzle?_
This is big brain
No, the patent covers any material which conducts heat from the heatblock into the melt zone within the bore, basically the guy was able to patent any bore that isn't a straight cylindrical shaft through a heatblock. It's an insanely overreaching patent, kinda surprising he could even get a patent that general tbh
@@xxportalxx. Unfortunate. Sadly this is what happens when the people looking over patent applications aren’t well versed in the field.
I came to say the same thing. If the patent is on melting geometries, than maybe not, but if the patent is for a high flow NOZZLE then maaybe.
You could also potentially make a heater block with high flow holes in it and then it would definitely not be a nozzle.
@@xxportalxx. i would think you could fine previous art for that. it would very much surprise me if this hadn't been used before in some industrial application or other high heat transfer application. also patents are by default written to be overreaching and see what sticks. makes them harder to fight/get around
One question, would sharpening the start of the 3 holes in your spacer help out with extrusion? because the CHT seems to have it to help slice the filament a little easier instead of being force melted through with brute force
I think its somewhat sharpened, just cause of the orientation when mounted. Sure, could be sharper, but the Filament doesnt just get bluntly shoved against the hex part of the spacer.
Also, the division is quite high up in the heat block, so the filament hasn't had much time to melt yet. There could be some advantage in tuning how far down the heat block the 3 holes commence.
@@jakob19982010 I don’t think it’s the hex part he’s talking about. In the CHT it has a sharpened middle which splits the filament before it gets fully melted. If you look at his DIY version there’s quite a bit more material in the middle.
I think adding a chamfer would decrease the flow resistance.
also how would that all effect retractions. For that reason alone I feel more confident in something like Micro Swiss TwinClad XT coated nazzle (it has 0.08 friction coefficient vs usual nickel plating that has 0.2), may help it gain on CHT, but I didn't see any direct test out of those yet. CNC Kitchen let doooo it :D
You can use the 3 holes to screw in the spacer - that way you don't need the hex socket and you might be able to improve the inlet geometry to reduce drag. Also, consider polishing the bores with a smooth wire charged with a polishing paste like Brasso.
Gonna be tricky to line up the holes though. The hex cavity makes that bit a non-issue. If the spacer gets a bit stuck, the leverage of a larger 3-4mm hex key might mean the difference between extraction and a useless, potentially quite expensive heatblock.
What we'd ideally have here, would maybe be a heatbreak with its hot side extended by 8.5mm. Only works for single straight bore though.
@@pr0xZen If it did happen to jam in the block, a simple twist drill bit would grab it enough to push it thru.
@@SteveEh That's assuming you're able to extract the heat break first without relieving the compression tension between it and the spacer. Depending on your hotend and heatbreak type, that might not realistically possible without shearing/breaking lt, with how thin walled the separation neck on a lot of heatbreaks are. Most heatbreaks do not have a nut or hex flange/collar on the hot side of the neck you can wrench on like the mosquito / dragon do. A snapped-off heatbreak stuck in there too, isn't gonna help. Nor will a hard AF snapped-off drill bit.
I just wrote this, lol. You could add a detent after doing the holes to aid flow. Point is to do the drilling on a flat stock.
@@Audio_Simon I was frankly surprised Stefan didn't do that, drilling an indent after doing the small holes to avoid flats and sharp edges perpendicular to flow. Or maybe he did and I might have missed it, watched it on my phone so details get very small.
Drilling an indent with the same 60° cone as at the nozzle end might be good? But making the indent spherical with a ball end mill might do well too.
You could try to cut a CHT and use it as a spacer, which might end up having a higher performance than the DIY HF Spacer
Exactly what i was going to say! If its not long enough to bridge 8.5mm just shorten the volcano nozzle accordingly to match. Then we get best of all worlds
@@vericksworkshop5007 or cut 2 cht nozzles
that works until you need to disassemble
@@julesadventures9174 with that in mind, he could cut a slot for a screwdriver using a handsaw. Might not be perfect but if it works, it works
@@lucasvp2005 Or Just make special wrench or screw driver that could use those 3 holes for grabbing.
For the 3-hole adapter: if you still have your 3-jaw chuck you can clamp the piece in it but place a small spacer on one of the jaws to create an offset of the rotational axis and drill the off-center hole pretty much standard as a concentric hole (but slower because of the imbalance). Then rotate it approximately by 120 degrees and repeat. The more professional solution would be a 4-jaw chuck with independent jaws.
Edit: do it on the flat side, not on the hex side
Good solution. There is no significant imbalance with these tiny parts and brass cutting speeds. Lathe headstocks are designed to swing some crazy off center loads. I also suggested ditching the hex and milling a slot afterwards to use a flat blade screwdriver for installation. If you want to get fancy, 2 slots on the edge lets you use a fork and keeps the melt zone clean of any potential diversions.
Good one. Do this and get rid of the hex nut slot, make a tool that mates with the three holes (Like another person suggested) and you should have better performance.
Came here to say something similar... Would suggest putting the (threaded) spacer in a nut (temp loktite it in) and 3-jaw chuck the nut instead of the threads. (Obviously, doesn't do much for precision, but it'll still be better than trying to do it in a drill press.
(Other advantage of putting it in a hex nut: Makes it really easy to index. Drill a hole, rotate it by 2 faces, drill a hole, rotate by 2 faces, done. Make sure your shim(s) stay on the same jaw(s) and your holes will be parallel and evenly arranged around the center.)
this is how i thought he was going to do it at first
Longtime viewer, first time commenter. Just wanted to say, I love your content, and the way you've standardized testing for filament is genius. There's not a lot of independently verified information about the performance characteristics of filament (that I know of), and it provides a great service to the 3d printing community.
I also appreciate seeing you getting into machining, as a machinist by trade myself. However, some of the things you do while machining drive me bonkers lol. The most apparent one, and the one I've seen commented on before, is drilling holes. You should always center drill, or spot drill, before a drill op. Not only is this best practice, but you'll greatly extend the time between resharpening your drill bits, as it takes a lot of load off of the tip of the drill bit (the most fragile part). This is likely why you were getting such massive deflection on the hotend with the copper wires.
Best of luck, and keep at it! Machining is an art, and very little things like that can effect results in ways that you wouldn't expect. Would highly recommend finding a machinist friend that you can consult with questions about fixturing and best practices!
Thank you for actually progressing the art instead of endless reviews of mediocre products as nearly all other 3dp 'creators' seem to be stuck on.
Seriously, Drinks on me if we ever cross paths.
Edit: Nitram included!
11:00 I suspect that much of the problems with the CHT nozzle high flow spacer combination is hole alignment once assembled in the heat block. Once the molten plastic exits one of the holes of the high flow type spacer, its not necessarily a straight shot into one of the three holes in the CHT nozzle. Add in the pocket from the recess for the socket drive key of the spacer and the slight pocket before the separation of the 3 holes of the CHT nozzle and and you are getting small turbulent / flow restriction pocket area at the interface between the spacer and the nozzle.
To possible solve the alignment and pocket issue, why not take a 3mm volcano nozzle (or a 1.75 and drill) and ream it to whatever bore size necessary (if necessary) then take a piece of brass bar stock and turn it to match the bore size (plus maybe .0 to .02mm or so for a light press fit) and drill your three 1.2mm holes in that slug thus giving you the 3 hole high flow design of the CHT nozzle but in the Volcano length with no spacer or misalignment and mid stream pocket problems associated with the "high flow spacer" and CHT nozzle. You could make the insert slug slightly longer than what the depth of the bore is of the nozzle thus allowing you to mill it back to be perfectly flush with the end of the nozzle where it seats against the heat break.
@Resto Ron Yep, even as little as a 32nd (0.8mm) lip from mismatched ports between the head(s) intake and/or exhaust can create enough turbulence in airflow that power and efficiency is lost.
A lot of people think, along the lines of area loss from the mismatch (which is often miniscule) but never consider that its not the area loss that is a problem but rather the turbulence created by the mismatch and turbulence kills airflow (or any fluid flow).
Countersink the holes on your high melting rate adapter so that the middle comes to a point like the CHT nozzle. I think the problem is that you have to melt most of the filament with that middle bridge part and that's limiting your flow rate. You want to split the filament instead so that it can melt in the smaller holes.
It still had the melting rate advantage though, which is why you got less die swell I think.
Life-time-all-you-can-eat Leberkas for Nitram and Stefan 😍
I have to visit you both next year
@@Nitram_3d Oh yeah do that, I’ll make some leberkas and provide some cool Bavarian beers ☺️
When needing to drill a hole on an angled surface, first spot face the start of the hole with a flat bottom endmill near the same size as the drill.
Exactly our just use the square end mill for the initial 4mm depending on the cutting flute length.
Or use a rigid setup and a spot drill.
A stub length drill setup as short as possible would have also had a much better chance to drill straight. Or... you know... just drill it from the flat side.
We need a 3D printing crossover episode where CNC Kitchen designs a nozzle and VOG uses resin printing plus investment casting to produce it. The upper bound on flow rate is determined by heater cartridge wattage, and the practical limit is determined by heat transfer (a function of contact time, surface area, and thermal conductivity). My first thought is a central channel that starts out like a Koch Snowflake and then lofts into a circle before the nozzle exit (and I would make the test nozzle out of copper to test the best case scenario).
No way, I was just doing the same thing! It's super cool to see some great data on this idea, and it's super interesting how little it affected the performance, given the massive improvement with the CHT. For the drilling, I've been trying to drill the holes first, then cut the angle to give the angled hole face. That way, I'm drilling on a flat surface instead of an angled one. additionally, instead of using a hex to screw it in, I'm just using a custom-made screwdriver with steel pegs that fit in the holes. That lets me use the chamfered start geometry that is on the CHT, which I think will improve the flow from what you saw. It also lets you just use m6 brass bolts, which are much easier to find. I'm going to try using your same testing style to test mine soon!
have you shared some pictures of the driver and the spacer somewhere ? would love to see it ! :D
To anyone watching this today, bondtech finally makes full sized volcano CHT nozzles.
Thanks for video Stefan. A couple of suggestions
1. Cut off nozzle part of CHT and use splitter as spacer for Volcano. Maybe increase cone on the nozzle input to match splitter output
2. With brass spacer there is no need to drill three holes, it's counterintuitive. Make a new spacer from volcano or standard nozzle. Drill spacer's output to a larger diameter, keep input diameter. Pressfit or just insert cross, bar, three-pointed star, spiral or whatever to the larger diameter part. Use with nozzle with increased input cone.
3. Please try to drill volcano and standard nozzles inputs to a larger diameter then pressfit spiral and straight metal strip
4. There is no need to have hex socket at all. Screw in your spacer, screw in the nozzle and align them. Then screw in your heat break and tighten it. Then you can assemble everything and/or change nozzles. Adding screw from side of heat block to secure spacer may help. Also, there are heat breaks with hex head which will help tighten, see "Mosquito heat break"
5. Please do materials vs CHT
Question for 4: How do you do the first step?
@@KentoCommenT if you have brand new heater block with clean thread then you should be able to screw in the spacer just by hands. If thread is not clean enough you can try burn out plastic remainings and/or use tap. To screw spacer in when it is too deep you can use any conical shaped tool like small pliers, round nose pliers, tweezers, round file, maybe even toothpick
This is great! And what makes the community such a great thing to be a part of. Thank you, Stefan.
Better option IMO is the high-flow spacer with a standard nozzle, because that would allow you to use hardened nozzles, including E3D's upcoming one with a diamond-like coating (DLC). The CHT nozzles are only nickel-plated brass.
Would you need a hardened spacer though as well? Perhaps it is not as crucial but it will eventually get trashed.
If you want to mess around with DLC nozzles and dont wanna wait, Phaetus already has a "DLC" nozzle
Ruby and Sapphire nozzles too, and 0.1mm micro-nozzles.
@@AmaroqStarwind i'd say the dlc is probably a better option as, because of the ruby, it is hard to get it in the same preferrable 60° angle for optimal flow characteristics like E3D's nozzles use, also Ruby's are expensive
@@BH4x0r Synthetic ruby and synthetic sapphire are both options, just like synthetic diamond-like carbon.
Also keep in mind that the entire diamond market is built on a scam.
As always, fascinating and useful information! I recently did a big vase mode print with that weird distortion, which I'd never experienced before. My speeds and feed rate weren't any higher than I normally use, but without retractions and moves, I think it wasn't able to properly melt the filament! This video solved one of the baffling 3D print issues I've run into over the last few years!
Machinist here... In order to drill the 3 holes into the brass it's much easier to start with an End Mill that can plunge into the material to create a flat spot and then use the drill. That should get you a more uniform and much easier to make extension piece!
I love your work!
thanks for all the uploads and helping me with my 3d printing adventures!
Thanks! Happy to hear that.
Interesting to see the differences with the second test. Glad you added that, I wouldn't have expected your adapter to work after seeing the graph
Hi Stefan, can you try using the DIY high flow modification on a volcano spacer?
It should be much easier to solder in some wires than to drill three tiny holes inside of a cone.
i've been wanting to do the volcano-cht adaptor! glad to see someone did it
I love how precise and meticulous this channel is
Extremely useful video since it shows a lot about plastic melting inside the nozzle.
Extremely interesting!
Thanks a lot!!!
The principle is similar to a "torpedo" that has been used in injection molding machines for many decades.
Hmm, so the patent is even inspired by existing technology?!?
Hot melt guns use it for long time.
wow i did not expect how interesting that was! i learned a lot thanks!
So interesting and counterintuitive! Very well done! You should try it with different nozzle diameters ass that may change the results
Another superb presentation with clarity and technical excellence. I do have a Volcano head with a 0.8mm nozzle. Your investigation shows me a direction to go to improve print speed: A CHT nozzle and a straight through extension for its ease of manufacturing. Vielen Dank.
Good job Stefan! I'? Great fan of yours videos. You make very good analysis, and lots of data which I got from your videos I use in my printing. In only one year I achieved lot of progress, from noob to expert and you have big contribution in this process.
Beautiful work Stefan!
Wow. Great work, thorough, well presented, interesting, directly relevant. Many thanks 🙏
Can't you use an end mill to flatten the inside of the hex bore? That would make drilling easier. Even a cheap AliExpress one in your drill press should work for brass.
I also suggest some light filing to sharpen the edges of your extension like the CHT nozzle.
Or just drill the 3 holes from the flat size and add that small indent later.
I tried that but using an endmill on a drill press that's super rigid mostly just screws up the hex.
@@CNCKitchen it might be a bit tricky bought you could also scrap the hex and make a custom tool that uses the 3 holes instead to screw it in. (3 busted drill bits of the same size in a small 3D printed part. )
Great content as always, really makes you think deeper about how it all works inside. My guess is that first having some significant straight bore to get the material soft enough to got into the smaller channels, then the smaller channels to make sure you really get a consistent temp profile across the flow field, and then a fairly long and gradually tapering bore all the way to the nozzle, so it can settle into a nice Poiseuille flow, would be ideal.
Rather than the center punching, I was thinking it should be helpful to overlay a piece of flat metal when drilling your holes, so your drill bit is maximially clamped near the relevant spot.
Tests are good, but I think you have to test how it affects retractions, most people made reviews and showed how well CHT pushes filament, but I have gut feeling that due to complex shape of the channel we might have issues with retractions. Would be nice topic for the video.
Mhm or it could be better due to how the pressure is distributed. There's really no way to know before testing!
Impressive! Excellent work!!
I tested a simple adapter with a straight 2.5mm bore and a cht a couple weeks ago on my Volcano dragon and got basically the same results.
Finally enough flow to break into the 5 minute benchy territory.
interesting stuff... may have to experiment with this idea!
Very interesting thanks for the quality of your contents.
What do I think? I think you are nuts! And I love it. Thank you, Stephan. You crack me up and I appreciate your videos, Sir.
Thats really neat nice work!
As an actual real proper CNC machinist i cry blood every time I see a video like this
Totally understand that but I need to use the tools I have at my disposal.
@@CNCKitchen want i mean is the tool at your disposal is a reseller selling the actual parts. No sense making something yourself with thousandths worth of equipment if you can just buy it for couple of hours wage for real. Not to undermine your work of course but you know.
love this work
Great video!
Thank you very much
Really appreciate your dedication! An end mill is much more rigid than a drill bit - using an end mill (or for precision, end mill then reamer) to make your 1.2mm holes might be easier in the future.
Very interesting my dear Stephan ! Thank you from France
I just made my own last night, i found simply jamming a Torx bit gives you plenty of grip to snug it up then turning the throat about 1/8-1/4 holds it on more than tight enough. I used copper anti seize on the adaptor and nozzle, left the throat dry as to prevent heat transfer.
I'm printing with a proper hardened nozzle (0.5mm), hasn't even got a scratch from me wrenching on it with pliers and the adaptor is copper (not brass) with a titanium throat. I was amazed how consistent the heat is. I printed ABS at 260c/250mms outer perimeters/infill and the parts show a slight glaze/shinny surface consistently through out. Then moving upto 400mms shows it matte on some parts of the peace's but no under extrusion at all, this is with a standard extruder 😳
Impressive implementation
Great idea!!
Thanks for sharing your experiences with all of us :-)
Its probably been suggested already, but im the future you could probably make a guide for you drill bit. Dill your 3 hols through a material that is easier to place them and use it to guide your bit to its final location. The center drill is absolutely a must as well. Good to see
Great video as always! Would be very interesting to test some high flow hotends like mosquito magnum and drogon HF with and without the cht nozzle. These combinations could give extreme flow rates
Wow, great work! 🔥🔥
I absolutely love your work man. These experiments are so fun to watch.
Thank you very much!
I'm really impressed your home made high flow spacer worked so well. I thought the filament would impact the middle of the spacer and cause all sorts of issues.
You mentioned this may be the cause of the abrupt failure at higher speeds. I'd be very interested to see this same spacer but with the entry to the 3 holes bored out more so the middle meets at a nice sharp point like the CHT nozzle.
Great video and impressive work to manufacture your test spacers.
A couple of fun nozzle ideas, for tool-changing print heads:
- Shotgun nozzle: Sprays filament in a spread-out pattern
- Spinning (angled) nozzle
A shotgun nozzle could work for extremely fast infill printing
@@celeron55 It could also be good for adding a randomized irregular texture to something, like a sort of "popcorn ceiling" effect.
And the spinning nozzles might be good if you just want to make a mess~
Great stuff, thank you!
It came to my mind with previous video on the subject. Drilling in nozzle's side might be tricky for someone without drillpress. I figured out that using flat piece of copper (hammered copper wire) and just sawing nothes in nozzle's top will be much easier. Would still need soldering though. Going this way would also lower the resistance as those copper strips in + pattern would work like slim knifes slicing through the filament on the entry. This could work for such extender/adapter as well with longer slits in its body.
I've found it interesting in first 30 seconds :D Great job on this investigation and tests.
Several people have suggested using a centre-cutting endmill to start the three holes, but another way is to push a piece of hex brass into the hex pocket, flatten off the end flush with the spacer surface, centre punch and drill. The same technique can be used to drill overlapping holes by filling each hole with brass rod after it's drilled, before drilling the next.
You are a great scientist Stephan.
Love your show
respect for you work
Really cool to see how you worked around the nozzle patent by creating a spacer to speed up the melting, although there is one thing you lose by using the spacer - the ability to do a 'proper' cold pull, I'd hate to have a clogged nozzle with that setup.
that actually is a fair point!
IF you even were to be able to perform a cold pull it would not be without damage....
amazing work as always!!!
Thank you! Cheers!
11:23 I think that you are correct when you said that you add additional stress by adding turns, but you may also have some unaligned holes by the junction of the the two thus creating more backpressure.
My thoughts exactly. It needs to be lined up correctly, possibly even keyed.
Thee CHT nozzle is a realy cool concept!
Nice, thanks!
Was wondering about that in combination with the rapido high flow adapter. I hope there's a way to make it fit there too.
Use a small carbide endmill to start the off center holes. It is stiff enough, and has a flat end so it does not deflect.
love the work here. have you tried making a jig from an allen tool? one angled hole in it as a guide. drops in, drill, droop in clocked 2 sides, and a third time.
For a remake of the High-Flow-Spacer, you could skip the initial counterbore and instead counterbore the individual paths on both ends to create the "wedges". This would also greatly simplify the process of actually drilling the extrusion paths, as you wouldn't be fighting against a sloped surface.
Great job as always! One simple idea for the adapter... can't you just use a straight tube spacer, like OD=5, ID=2? The lack of thread engagement would translate to slightly less thermal conduction, but as long as it's copper it shouldn't be a deal breaker, and it would be much easier to make & install.
I was thinking along the same lines. Could you modify the heat block to not need the spacer to be threaded. Or have a threaded section with a large bore that the smaller space slides through.
Have you considered using copper slip/copper anti seize. It's used on the back of brake pads and on the studs /nuts on an exhaust manifold often so it's very hear resistant but also due to it being copper has very high thermal conductivity so should be perfect anti seize for this application.
I think the "one hole" adapter is much better because you are pre-heating the filament such that when it gets to the CHT 3-hole section it is soft enough such that it doesn't fight the feeder so much. PRE HEAT FOR THE WIN!
Yesss! As a volcano user, the CHT was great but not so in converting all my systems away from volcano, now I'll just patiently wait for someone to make proper extension bores and can upgrade my volcano's into something even better!
Just a little idea that came to my mind yesterday :
replace the wire in the diy high-flow hotend by a thin strip => you would get core heating and laminar flow in the same time.
About the machining process, I though of this procedure :
1)drill a .4-1mm hole in the threads of a v6 nozzle
2)by using a jewellery saw, or one of the tipe with really thin blades that are straightened by the rest of the saw that pull on the ends of the blade (with a wide U shape), findable in hardware stores here in france. You pull the blade through the holes, thight it in the saw and extens the holes into grooves,
3) pull a thin strip of thermally conductive metal (copper, brass, nickel seems easily sourceable as it's used in Li-ion battery packs, aluminium should be common in cakes packaging or cans, just don't forget to get yourself special solder for aluminium)
4) solder the strip in place
5) cut off the excess material
6) thread back the nozzle
Are you sure the holes in the HF adapter and the CHT nozzles line up perfectly? If they're off like 15 degrees I'm sure that would make a huge difference.
Was thinking about this, the only ways to get the holes lined up is to change the length or drill the hol specifically to match. Given the holes are drilled using the hex as a guide, and there is no guarantee of consistency between the alignment of the hex and the threads. So you would need to shorten the hex side until the it lines up, which could take up to 1/6 of a thread before drilling or 1/3 of a thread after drilling. At 1mm thread pitch, that is either .166..mm or .33..mm. to do it predrilled the best option would require marking or others determining the position of hex as reference, because you necessarily have to cover the hex when checking the alignment. for post drilling, you may use up more length and for both need to account for that, leaving the insert longer it to proper length only at the end of the process.
Assuming a variation of length ~.33mm matters.
They didn't line up but that's probably for the better, since the new arrangement of thermal contact surfaces can further heat the parts of the material which weren't truly molten yet and homogenise it.
I'm sure others have said this already, but I would forget the hex hole, and just get a threaded brass rod at the proper length.
1. Using a drill press or milling machine and a vertical chuck, drill the three holes, rotating the chuck 120 degrees between each hole (I would advise putting the holes as close to the center as reasonable)
2. Countersink both ends of each hole so that in the end the holes meet at a point in the center, just like on the CHT hot end
3. Either fashion a special forked tool that lets you screw the spacer into the heater block by putting the tines into the three holes
OR
Cut a shallow line across one end of the spacer so that a flathead screwdriver can drive the spacer into the heater block.
I expect this should help reduce the resistance to flow and may also help to reduce turbulent flow exiting the spacer.
This with a Pellet Extruder Sounds amazing. Maybe i schould try it on my printer
When drilling the 3 holes a simple way to minimize drill walk is to fill the void with a material that can be easily removed afterwards. Flatten the end and you have a nice easy to reach surface to start on.
i picked up like 10 of the CHT nozzles. holy shit they are badass. total game changer
You have no way of knowing if the holes in the high-flow-adapter line up with the holes in the CHT nozzle. The combination of the two could actually lead to significantly worse performance if they were far enough out of alignment.
I noticed you screwed the spacer in from the nozzle end, which results in a cavity where the recess for the hex socket is. Wouldnt it be better to screw it in from the top of the block to remove the cavity? I'd have thought that cavity would have an effect on retraction, backpressure etc.
Good point but quite hard to do on an Hemera due to the installation order. It would be possible but I pain if you regularly want to change something.
@@CNCKitchen in your testing yes it makes sense to do it from the bottom because of the repeated testing. But for someone doing it once, would be better done from the top i'd assume.
@@ozcanison how do you get the heater block in the desired orientation if assembling from the top?
I just improved my volcano hotend by moving the temperature sensor from it's original bit more far from the heating element. I just drilled an extra hole for the sensor. Originally it was positioned between the heater element and nozzle which I don't find to be optimal.
I'd probably use more than one sensor.
Very cool stuff!
Wonder about retraction on the Std. V6 + HF spacer would cause issues?
For doing tiny drilling like that, you could print a sleeve for the drill bit that is 10mm from the end of the bit and is long enough to butt against the chuck of the drill press. That should stiffen the drill bit enough to allow it to act like a short jobber bit then you can remove it once you are able to go deeper on the drilling. Also, when you make tiny punches like the one in the video, you can use a trick that TIG welders use to sharpen their tungsten rods. Put the thing you want to put a point on into your cordless drill and use that to spin the metal while you take it to a grinder. You get more control and a nicer cone shape on it, plus you wont burn your fingers from the heat creep.
I'd really like to see tests with:
combination with other filaments like PETG and ABS and/or nylon
Strenght after printing?
Would be really interesting to make a real high-performance printer I think
Did he ever show how he lined up the three holes when the CHT and HF adapter were installed together? I think that even a slight misalignment of the holes would cause an increase in flow resistance.
The hex cavity would give the filament room to flow between the spacer and the nozzle.
Really loving the CHT series! Keep it up! Absolutely crazy effort on this, I can only imagine the frustration! Very interesting to see how nice the CHT is on its designed setup! Very interesting to see how all this pans out! I hope Bondtech does the CHT in hardened but I have a feeling that wont last long! Thanks again for the great video!
well done
Wirklich mal wieder eine saubere Studie! Kleine Anmerkung: Die Dimensionierung der drei Bohrungen sollte nicht nach dem Kontinuitäts-Prinzip sondern nach Hagen-Poiseuille (Reibungsdruckabfall im Rohr) erfolgen. Dann kommt man in Näherung (dV/dt=konst.) zu r2^4/(3*r1)^4 = konst. und damit zu knapp 1,5mm je Bohrung. Damit sollte die Extrusionskraft in etwas konstant bleiben können.
you should make an insert to allign the drill bit, I can't say if a 3D printed one would stand up at that size, but it is worth a try.
Stefan, it is a very interesting video. Nozzle is expensive... make your adapter. Mind blown
you can use an endmill to start drill holes on angled surfaces
omg i had this idea yesterday
I always find your investigations interesting.
Shorten the drill bit to create the pilot hole to avoid deflection. It can be easily done by either buying shorter drill bits or by placing the longer drill bit deeper into the chuck..
You should use a center cutting end mill, when trying to drill the 3 holes. You won't get any deflection. But only to get them started then change to a normal drill.
Wow this is some real science here
I would try cutting the CHT nozzle as the spacer, and cut a volcano nozzle down to fit. This would provide the precision machined division to quickly melt the filament, then combine again into the standard nozzle. this might reduce the pressure enough to get a bit more performance before the extruder starts to slip.
The CHT opening acts as a blade. The blade is needed at the beginning of the splitting of the not thru-melted filament. Maybe you should cut the nozzle of 2 more CHT nozzels and make them an extention
Awesome as usual. This may become a thing...