CoreXY explained: Comparison + strengths & weaknesses
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- Опубліковано 6 чер 2024
- CoreXY seems quite popular at the moment, with a range of printers now available from manufacturers. This is on top of great designs such as the Hypercube on Thingiverse. In this video, a comparison between CoreXY, various cartesian and the delta motion system is made, exploring the strengths and weaknesses of each.
A summary for CoreXY:
-Space efficient
-Rigid cube frame (typically)
-Two stepper motors sharing X/Y movement 99% of the time
-Fast and precise when used with a light print head, which is generally inherent with no moving bed for X and Y
-Belt tension is critical
-A rigid frame and pulley system is critical
-Getting these wrong may ruin the output of the printer, getting them right may raise the cost.
Thanks to Seckit3DP and Tronxy for responding to my question during the making of this video.
Designing 3D printers: Essential Knowledge by Neil Rosenberg on Amazon: amzn.to/2rhiVxx
My initial Seckit SK-Go video: • SecKit SK-GO assembly ...
Cartesian Motion system: en.wikipedia.org/wiki/Cartesi...
Mendel printing video by largecamel: • RepRap Prusa Mendel Pr...
Prusa CoreXY announcement: blog.prusaprinters.org/origin...
Hypercube by Tech2C: www.thingiverse.com/thing:175...
CoreXY kinematics explained with paper by CRT on Vector3D: • CoreXY Explained With ...
CoreXY kinematics maths explained by CRT on Vector3D: • How Do CoreXY Kinemati...
Scara 3D printer demonstration video by 3D Potter: • Scara Mini Going Tall
CoreXY vs H-Bot discussion: reprap.org/forum/read.php?397...
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A very big advantage of coreXY that is totally underrated is that you can move the steppers outside of the heating chamber rather easily (due to XYZ and E) steppers being fixed in place. This allows for a stepperless volume inside of the frame and this allows for higher temperatures without watercooling.
@curio I think the main advantage is you dont have as many wires moving around with the part and the fact that the gantry is lighter because it doesnt have a large stepper motor on it. With more weight on the gantry, the printer is more likely to miss steps at high printing speeds
@curio Yeah, I guess that would be a downside. You would really need to tighten the belts good for that accuracy.
InstaBlaster...
IIRC some company has a patent on having steppers outside the heated chamber though, and was going around sueing people that were just selling enclosures.
@@randomuser6110 That should be a easy patent to invalidate. The solution is obvious and in no way novel. The heat dissipation of the motors necessitates it.
I think I have watched this excellent video 5 times now. Whenever I forget how cartesian, delta and coreXY systems work and need a refresh...there is no better concise source than this video. Thank you again for making and sharing.
Another wonderfully educational video. I’ve got one Delta printer (a Kossel Mini), one Cartesian i3 style (a Prusa MK3S) and one CoreXY (RailCore 300ZL). I most enjoy watching the Delta, as it just looks so COOL. The Cartesian is a solid, steady workhorse. The CoreXY produces the best prints (beautiful layer stacking, for example). I do think it is easier to get very good prints from the Cartesian than from the others two types of printers, but each has their place.
Love your videos, they have been extremely helpful. I recently bought a Tronxy x5sa-400 and I'm having a heck of time getting it to print properly. I'm upgrading a number of the components on it so hopefully it will alleviate the sloppy prints I've been getting.
We as consumers are the winners in this. Can't wait to get my Sekit.
Mate I love the way you are so effective with you explanations. I have just bought a Voron 2.4 after using a Prusa for a few years.
I just bought a Bambu Labs X1-Carbon, and it is my first CoreXY printer. I was trying to figure out the belt system. Thank you for the great video. I love all of your vids!
Hi Michael, thanks for this particularly clear video explaining Core XY printers, and comparing them with the other motion systems. I've been curious about Core XY machines but haven't had a chance to dig into them in a meaningful way, but after seeing this, I'm a lot more intrigued by them. 👍
BV3D: Bryan Vines there is a lot more to core XY than shown, Michael has only scratched the surface, and to add the core XY design methodology has been round since 2006
Wonderful, detailed overview!! Excellent timing with so much buzz around coreXY these days!!
Fantastic video mate. A really great explanation of kinematics of linear motion systems and the math going in behind the scenes. Love your videos
CHOPPED!
I like that MCM shirt you wearing ;)
I started with 3d printing by designing my own corexy printer. now, in iteration 5 i tackeled to go to linear rails instead of rods and also getting a open frame design with no belts in the front. so far only good experiences.
How is the accuracy? I’m wanting a second machine for high accuracy and tight tolerances. For $500 and under would you still go with core XY or more conventional (like Ender 3 or Ender 5)?
If I were starting from scratch and only had one machine it probably would have been core XY (except I made my Frankenstein Bowden Prusa like 7 years ago, before XY was really a thing), because I love speed and I’ve seen videos of core XY machines hitting 500 mm/s on what I’d consider nothing fancy (no lightening holes or carbon fiber etc, just cheap generic parts. Granted not great printing but it wasn’t a blob or spaghetti, haha!).
I’m happy most of my Prusas prints (I can crank out 3 inch diameter by half inch thick solid infil double herringbone gears in about 10 minutes, whereas I think that’s normally 4 hours for most people’s printers of similar price tier). I mostly use it for rapid prototyping (like in 1 day I went through 5 different water pump revisions, so CAD/print/test/analyze data and repeat 5 times in an afternoon), so speed was pertinent, BUT now that I’ve got that base covered I want something for high accuracy for press fit replacement parts etc and need it within say 0.2mm or 0.001 inch. My machine does great for those gears and most things but sometimes it shows it age, haha! So now I’m just looking for one that can chug along consistently to fulfill that side (and now it has time to do so, it’s got 8+ hours while I’m away at work).
Didn’t notice the MCM shirt until you said it.
That Scara (sp?) setup looked incredible, with a proper mechanical build and mounting I can see it being quiet versatile even beyond 3D printing.
This chap made one ua-cam.com/video/rPv6Gz0YBNQ/v-deo.html
Im looking to get one of these printers in the near future. Thank you so much for putting out all of the good info!
I came home with a donated CoreXY "Ulti'crater" (?) from the free pile at Craigslist the other month and am very new to its configuration. I look to get it in the air for what I can with updated Marlin FW on its Arduino/RAMPS 1.4 electronics; it will be an ongoing project for a while, and we'll see how it goes. Great review - thank you.
use skr 1.3 or 1.4 , mega is bottlenecking its potential with its computing power
I’ve made two of Tech2C’s Hypercube printers now. Love them.
Thanks, greight video.
I built a Hypercube Evo (HEvo), but there were so many designs flaws I had to do a lot of re-designing. So mine is a HEvoEvo!
10:35 Anything done to the printer like any mods or exhausting fine tuning or upgrading or anything or just out of the box with basic assembly and setting up?
Michael as usual thank you for your fantastic videos.
Great video! As usual...
@teaching tech where did you find the beautiful model of the mask shown in the video?
Thanks for the good explanation. I am a corexy 3d printer designer myself and really like the kinematics. But as you say belts gets long and you need a good construction to make sure the idlers are rigid. Take a look at my new CoreXY utilizing the new gates type idlers if you are interested. Best regards Roy
I'm really interested in the X5Sa pro review. I have the Artillery SW X1 now and the ringing in Y direction, especially on tall prints is pretty bad unless slowed way down. Would be nice to be able to add speed.
Just bought the ender 6 core xy. Can't wait to test this out :)
Great walkthrough👍
Thanks for sharing this great video👍😀
Can not wait for your tronxy x5sa pro review! I have one for 3 weeks now and it prints good.
I was really wanting the sk go. Looks like it will be a while... I may just save up for the prusa xl or whatever they're going to call it. I really like prusa customer support and ther great community and the work they have done to help make 3d printing an affordable hobby.
Thank you for the video, mate! Now that 2 years have passed since this video was out, which CoreXY printer under 800€ could we consider to purchase at this point? (considering an excellent extruder to print everything, good motors, rigidity, printing volume, heated bed and excellent belts?
Good video explaining the pros and cons, I think it's a good compromise but I think for ease the Cartesian with the bed moving up and down is the best idea.
@vial.of.photons Everything has compromise my friend, I believe he even made this point himself. It'd life.
Thanks for the video. New to 3d printing and this helped me understand what corexy is.
Great video. Thank you
I'd put in a vote for replacing the Bowden tube if your printer has a cheap one (ender 3).
I just had mine break off IN the hot end. It was so baked in that I had to finally remove the hotend and drill it out.
Printing for a month and never over 225.
A very interesting concept, thank you to explain it so well.
Really hope your tronxy review is coming out soon, im just waiting for a good deal during the amazon cyber week. Would really love to hear your thoughts.
Very good review and lots of information. Keep it up!!
The manufacturers left out the most important part about the design which is not having to carry the mass of the x-axis stepper motor around along with the x-axis which reduces moved mass. The mere fact that the two steppers work together to move the printhead is not really an argument for corexy in my opinion as they also do that in regular Cartesian systems when moving diagonally - the same way a corexy uses only on motor when moving diagonally. It becomes more obvious when you imagine rotating the rectangular bed 45 degrees around the z-axis on those printers. It is funny how they seem to have used the design principle without fully understanding the main reason to use it.
Good point, but I wouldn't assume this was an exhaustive answer. They are trying to run a business and I'm pestering them for answers on this video.
Yes that sounds reasonable, Michael. They should know better than giving you quick answers though. No better way to get proper information out there than your channel.
they focused on light printing head though. just did not mention why the head is lighter.
In the Ultimaker type printers (cartesian), all steppers are fixed to the frame.
More than likely these were spokespeople or sales team and not engineers- and therefor likely are not trained on technical intricacies and might not even be given accurate information, though I'm happy to see someone hit upon the reason why I am trying to use a CoreXY system for my next build.
Did you publish the video where you reviewed tronxy X5sa that you mentioned on the video?
That's to come. I haven't had it together very long.
What really stands out to me, is the required footprint for a heated enclosure. Might even be able to print pei and peek with this, if you find belts that can play ball with the heat at such lengths. Since the steppers are static, these could be mounted outside of the enclosure, greatly easing the cooling system design.
Where can we get the STL for that mask?
Another great, comprehensively informative presentation. I wish we had this technology when I was in school and someone like you to teach me.
Very helpful and interesting, off to read that forum debate now!
Thanks for the good overview.
One question, how vulnerable are CoreXY machines to racking the X axis? (i.e. the two ends moving different amounts).
Do the belts really do a good job of moving each end evenly? or do they depends on the mechanical linkages on the rails to resist racking?
Think of something constructed similar to the MPCNC which has almost no resistance to racking (due to the large size and flex in the plastic), could that sort of structure be used in a CoreXY configuration? or would it rack and be inaccurate or bind up?
David Lang core XY does not have racking issues, the main issue with core XY is the belt tensioning, if the tensioning of the belts is uneven it will skew the X axis and cause prints to be trapezoidal and then it would be required to enable marlin’s skew correction feature. To correct for the skewed axis on the printer. Or tension the belts to be firm but not tight, to prevent axis skewing
Did you ever get to review the saphire + or pro? Iam just curious as I just bought the pro model and would love to hear your pros and cons on the machine.
thank you so much for this video!
Great video as always Michael. I've pondered building a Core XY for several years, though not got round to it yet. I'm looking forward to Prusa's one, I'm planning to order it. I find the kinematics fascinating to watch.
Yeah, my first non-all in one printer was the X5SA and I am so happy it was. I've modified it a little bit to make it more sturdy, but the speed at which it can print and not reduce quality is amazing
If you can make a rigid y-axis, consider making an H-bot
@@haley8004 I have considered building an H-Bot too. For some reason I kinda like Core XY better, although I may well try both if I get round to it.
@@spikekent Interesting. For me the longer belts that want to intersect put me off corexy. Industry machines are more often H-bot I think.
Joshua Vasquez has shown a very nice open source corexy on youtube and also this article comparing H-bot and corexy. www.doublejumpelectric.com/projects/core_xy/2014-07-15-core_xy/
Fantastic explanation Michael. Thanks.
Have a look at Railcore printers. Very nice coreXY design.
I love CoreXY. Back in 2014 I have designed and built my own laser cutter using a big CoreXY motion system. Looking back at this video, my design was pretty modern back in 2014 haha. I wish I had realized that back in the day.
Yeah. You would have made mint.
@@Aethelbeorn Not everything is about money ;)
Excellent! Thx for another great video:) Keep it up...
I enjoy my Core XY X5SA, I have modified it a bit to make it print stable at 100mm/s. Love the speed and that it prints the same quality as a 30mm/s print.
Please could you tell what mods did you install?
@@MassimoFantinato Yeah no problem
www.thingiverse.com/thing:2771055 this one is for the frame rigidity. You can opt in for some metal ones but these did the trick for me
www.thingiverse.com/thing:2809623 this is amazing, and I had to slightly modify the next part in cad software to fuse the bottom part of this model into the top of the next thing to make them both align correctly
www.thingiverse.com/make:503069 this makes the bowden tube shorter and also allows it to sit along the cable chain, always having a nice path for the filament to push through and not get skipping or hung up.
And finally www.thingiverse.com/thing:3503426 I did this because it makes the X and Y axis rigid and makes the belts all align correctly. You will need to go a hardware store for new screws and such for this.
OH and for the hot end i use this currently www.thingiverse.com/thing:2792412 with www.thingiverse.com/thing:2922982 (i modified it in cad to fuse the two parts together to print it all in one but you can print them separately and just fit them together with some glue or something)
Subtle correction on a super-awesome video: the Prusa i3-style mechanics didn't start with the Prusa Mendel, it started with the RepRap Mendel (of Bowyer, Oliver, et al. fame), which the Prusa Mendel is based on and ultimately kickstarted the home/DIY 3D printing game.
I remember seeing Vik posting on NZ Linux mailing lists about his new reprap project a decade or so ago - didn't think anything of it at the time. I met him once, he's a cool dude!
You explained this so perfectly!
You are a perfect teacher! Cheers mate!
Really informative, thanks very much !
The robot arm approach has the advantage of a big print volume, especially in the x direction with a very compact printer.
But the precision of the arm movement is critical and such an arm might be unstable even when it is not moving at all. And the errors of both arms add together to the errors and unstable position of the printing head.
Good content.. I have hyper cube diy.. But I need to improve it I Wana add linear rail is best motion system so what is linear rail. Size u using on your corexy
I've had my first printer about 2 weeks now, a Tronxy X5SA pro that I got as an Amazon return. With upgrades to stiffen the hell out of the frame, I have a large printer for less than $200. Heh, now I just need to figure out how to use it. Their design seems pretty good for the price, and it's first print looks way nicer than much of the pictures I see posted around the net.
I still want a delta though, mostly just because they are almost hypnotic to watch in action.
Another tradeoff worth mentioning is that if someone wants to upgrade their coreXY with dual independent extruders (IDEX), each hotend would need to be on its own X-carriage, with its own belt system, and its own pair of steppers. I would love to see someone take on such a project. BTW, we're still waiting on that SCARA video you said you might do ;)
Not exactly if your smart with bar and roller placement they can be on the same
Dual Markforged Kinematics such as on Rat Rig V-Core 3.1 IDEX is close, but I can't quite picture full CoreXY with dual printheads. It the FrankenVoron Tridex still CoreXY? I can't tell.
thx for this video, i finally know what type of printer I want to build
Love your analysis of the different 3D printing architectures // for FDM :)
I second your opinion that DELTA's are awesome, I ran one of those little Monoprice Deltas until it broke, 12 days later //
Ordered a Prusa Mini for go 3 on 3D printing at home // still vapor in the cloud somewhere CZ etc // excited to get it going // like so many others who ordered one
I would love to see a detailed review of TronXY you mentioned in the begining of this video.
You are the 13th comment in my view... So I watched it before seeing your comment ;-)
sorry...
Is there away to upgrade the Z axis on a ender 5 plus?
To keep bed leveled at all times. Woukd only have to worry about the bed plate being waroed over time.
Quite informative.
Thanks!
i have a core xy to be exact it's the tronxy x5sa 400 that the z motors keep desyncing any suggestion? when it does print right it prints great.
Thank you, very enlightening.
Really great video as usual done very well and too the point thanks Have you seen the DIY CORE XY That is made of wood?
Nice video. I do own a Tronxy X5SA 330x330x400 and upgraded it a lot to be safer, sturdier and smoother. Printed PETG parts for the step motors and idle corners are fine, just need to be thick and a good infill. I've changed as well the 2 belt for a single one allowing the tension all in one go. Great printer, but quite complex to setup. WIll probably still upgrade it even more to a pro to get the rails and metal wheels. The ruber ones worm out too fast.
Is it worth it to get lineaire rails for a smaller core xy? 200x200 for example?
nice MCM shirt! My favorite Aussie youtubers
so just to see if i'm getting this right; with a corexy, the print bed moves away from the extruding source, similarly to how a resin printer pulls it's item up away from the light source it uses? would this change how you would need to design support structures to your models?
With these machines, yes, but that is not exclusive to coreXY. You could potentially have a stationary bed and the whole coreXY motion system could lift up and down, but that would be inefficient.
SainSmart Coreception CoreXY 3D Printer, Nice design!
Deltas are fun. A big one is like watching a giant spider. I built a 6' tall one, and it's fascinating watching it move. A scara is definitely in my future, watching robots make things is fascinating, especially when everything is working as intended.
Great, now I’m never gonna get a delta and still have nightmares about some 6 foot tall spider dancing around...
Hi, what is the model of 3d priter you used for ilustration? I mean that one that has linear rails.
I´m interested too
I just recently learned there is a new motion system called Croxy. It is kind of a beefed-up version of a cartesian setup, but shares some of the same benefits of CoreXY.
Similarities:
1. CoreXY and Croxy both have a separate Z stepper motor.
2. CoreXY and Croxy both used fixed motors and benefit from lower moving mass on the gantry and the ability to isolate the motors from a heated chamber if necessary.
Differences:
1. Croxy uses four motors, two for X and two for Y, whereas CoreXY uses two. This makes Croxy more expensive, but also more powerful and simpler in some ways than CoreXY.
2. Croxy move calculations are simpler than CoreXY and should be completely identical to standard cartesian, just with two motors running X commands, and two motors running Y commands.
3. Croxy uses a belt routing path that is much simpler and shorter than CoreXY.
4. Croxy uses a crossed gantry design (two bars, one for X and one for Y). This is slightly more moving mass than CoreXY, but each axis having two motors, shouldn't be a problem.
5. CoreXY is weakest doing diagonal moves because, at a 45 degree angle, a single motor is doing all the work. A Croxy is weakest moving in a straight X or straight Y direction, but in either case, it has the power of two motors to perform the move. On a diagonal (longer) move, it has the power of all four motors.
That Croxy of yours looks like an evolution of an Ultimaker cartesian gantry rather than the CoreXY one. But it is cute, i can see the value.
Also reminds one perhaps not to discount the Ultimaker gantry as a valuable approach. It can be a spectacularly cheap sort of build if implemented similarly to how it is originally.
I'm looking at a BLV mgn Cube. What are your thoughts about it?.
Another amazing video you are the real deal
A CoreXY printer doesn't actually need to do any more calculations; it's still doing cartesian movement, just in a 45 degree rotated reference frame. If you rotate the bed 45 degrees in your slicer, only the homing procedure would need to know anything different from a printer where the axis are aligned with the bed edges. And the math is ridiculously simple; A=X+Y, B=X-Y. Delta, Scara or polar movements are far more complex.
The part about both motors participating in a move is a bit of a double edged sword; not only is it only for moves aligned with X or Y axis, it means the motors are moving a different weight depending on whether it's moving mostly in Y or mostly in X. And they do so by varying tension along the Y axis differentially, so it's critical the X axis bar is rigidly perpendicular to the Y axis even as it moves along it.
The Ender 5 design instead uses a stronger Y motor to cope with the larger weight it moves and a common axle drives both Y belts to hold the X axis at a constant angle, even if it somehow isn't quite perpendicular to Y.
Hey Michael, what is the clock in the beginning?
Just a cheap ebay clock I used to use for timelapses. Reset it to 0 o'clock and let it run in the background.
Have you reviewed the Ender-6 .... and is it ready a Core XY format?
Grt video. So is fix bed Cartesian the best? Can we convert printer from corexy to Cartesian
Great explanation. Thanks
I'm also gonna give it a try (as have others before me..😅) Can you tell us where you got the STL for the mask? Again great vid btw!
Excellent content. Thank you.
Is the ultimaker cura capable to use this kind of printer?
with a core xy config if you were to upscale the design would you need to scale both axis equally or could you make a rectangular build volume?
You can make a rectangular envelope, no problem.
But you don't have the latitude to go too wild on the overall belt length, as belt oscillation can become an issue. Unless you massively uprate the belts. If you use steel core belt, it can go longer with less stretch, but doesn't take corners too well so you'll need larger pulleys and idlers. Larger motor pulley means more effective travel per motor step, so less precise position control, so you may need to uprate the motors to smaller step size and higher quality with less distortion. Other way to uprate the belts is to make them wider rather than stiffer and use better quality product.
Have an Ender 3 and and built a V-King (coreXY and worm gear belt driven Z)...Ender 3 still has a special place in my heart but V-King is the one that gets used the most and has been a pleasure to build and use
I want a delta next :D
Again excellent video
so a 45 deg rotated print on something like a ultimaker or zotrax is the same as corexy?
that was helpfull, definately. thank you man
Great video, got me thinking - whats the problem of making a hybrid between - catesian and core XY- Have only one belt making P shaped course to control the X and one or 2 motors for controling the Y ( Belt path is the same as on Ender 3's Y ) . On a core XY the X carriadge goes diagonaly because the other motor acts like anchor point. I guess it will be just a catesian printer with motion system of almost core XY.
That sounds like the h-bot design mentioned near the end.
Is it possible to add a direct drive set extuder up to the print head of a core XY printer or is the added weight too much and will it interfere with the print quality?
Yes it can work fine, depending on how well you build the printer. Direct drive allows you to print with flexible filament, something you can't do with a Bowden type extruder. My X axis weighs about 1.5 kg and it works just fine with a 46 mm motor on the extruder.
The extra work needed for the CPU in a CoreXY is one addition and one subtraction per G-code that moves the printhead. That's completely insignificant. (Unless it's a really inefficient implementation.) It's not like a delta, where you (at least theoretically) need to do extra calculations for each stepper motor step.
Agreed. Delta is hard to align, everything has to be precise (unlikely with a hobbyist budget) to get layers flat instead of bowl or multiple-curve-bowl shapes, distortions, etc.
I am thinking of getting either a correct or a crony printer. I like the fact that the bed dos not have to move back and forth. I prefer a 4 lead screw in each corner configuration. I think it makes for a much more stable bed.
Still a helpful video today was trying to find an example of what the ender 5's movement is. I knew it was a thing but couldn't think of a printer offhand that used it.
Was brainstorming a large format that could have independent dual print heads. I can visualize it on that style of movement but not core xy.
high quality video with a lot of research ! =D
thanks buddy for these inspiring videos.
He did not do enough research, the Ultimaker printer is core XY and came out in 2010
@@Celcius1 ok
From an engineering prospective I found that one of the biggest weaknesses of the CoreXY is the that long belt length and tension distribution throughout the X & Y axis's. I built one of these and was disappointed with the result. I use my 3d prints for engineering projects, and found that the CoreXY struggles more to print with precision. If it is going to bother you that your print is going to come out with slightly oval holes instead of the circular holes in your design, I would recommend the Cartesian style over the CoreXY. If you know you are going to be printing mostly pieces of art that won't rely on a definite level of precision, you may benefit more from off loading one of the motors in the mechanics with the CoreXY. Honestly though, I feel that the drawbacks from carrying the extra motor with the Cartesian style printer is worth the sacrifice. You could always use a larger motor to compensate for the extra mass that needs to be carried. At the end of the day it's more important to me to have the quality that the Cartesian style provides, even if it takes slightly longer to pull the print off the bed. Never tried the Delta style due to all the problems I predict that I would deal with getting an accurate print. Firmware is getting better however to address some of these issues hopefully... eventually.., but that still would add additional calibration settings to deal with, and like mentioned these add additional calculations that will need to be made, but perhaps not an issue to concern you on a 32 bit board.
Did anyone try a chain driven design yet? Or would that simply not work?
@@deathbornderhatkid2997 thats genuinely a good idea
@@Edgajado Nah that comes with its own set of difficulties. It would just solve some problems. Its worth a try tho
I get perfect circle on my ultimaker. Iv'e done things as precise as valve stem covers with thread and they were flawless.
Why don’t we use ball screws on all axis like on the best CNC machines? Thanks
Hello, the H bot is like the corexy ? (In the firmware?)
So question I know weight is a big deal however do you think even with a upgraded rail and belt and motors this could work dual extruders for instance combining ender idex and corexy in some manner?
Cuz I can only imagine the speed of 2 extruders working on this maybe you could set them to go 45 degrees opposite so they don't crash like mirror their movement completely with the belts somehow independently but I'd assume it would need a 3rd motor atleast maybe an extra stepper and an extra belt but I got no idea but that would be the dream on a ender extender if it's possible
I can only find core xy designs with square beds. Is it possible to build one with rectangle bed?
it is but the XY structure would still need to be square
Would be interesting to compare belts. Polychains or HTDs, which are used on most printers, are not supposed to be great at positionning accuracy and repeatability but rather high torque transmission. We should be using T / AT belts.
I know this is an old video now, but what printer is that? I'm thinking of taking up a Core XY conversion project and it seems all the available guide or existing printers I can find have the printer bed raise/lower instead of having the printer head also move on the Z-axis and have a static bed plate. Having found no other examples, I don't know how good of an idea that kind of thing is.
Hi Michael, thanks for another useful video. GT2 belts have become the de facto in our hobby. With CoreXY and small CNC routers, is there a case for going up to a larger spec system, or doubling-up on GT2's? Are all GT2 belts created equal, or do some have greater strength and less stretch? I watched Thomas Sanladerer's (sadly foreshortened) MPCNC series, and he had rigidity issues that others did not seem to suffer from. Maybe belt quality was a contributing factor? There's plenty of worms still left in the can, I think!
Out of curiosity, I watched the SCARA pottery video. Fine detail may not be so important, and the vase did have a small footprint, but it seemed to be doing an amazing job considering it was moving around a cartridge of clay.
Belts are not all made equal. Alot of cheap printers have issues because of cheap belts. Projects like the Voron recommend higher quality GATES(UNITTA) Aramid (Kevlar) reinforced belts. They have a red tinge to them. Gates invented GT2 and GT3 was released after the patent expired. You can find a lot of info about belt usage and performance in just their product data. www.sdp-si.com/products/GT-Timing-Belts-and-Pulleys.php Cheap pulleys can also cause issues. This is also an overlooked issue.
Tom's issue was already known on their forums, you can read about it in their video thread as a user had examples posted. The problem is both the motor and the mount he was using. The MPCNC has not curated/quality controlled the suggested parts as much as some other projects.The guy in charge of the project is willfully ignorant of how companies that make money off open source work. He also fails to understand that his project wouldn't exist without it.
www.unitta.co.jp/products/industry/special/rf
@@Deneteus : I appreciate the reply thanks. It figures that Gates would "pop-up"... fifty five years ago, Gates V--belts were the only ones that did not climb out of the pulleys on my race engines! (Jeez I'm OLD!) In my retirement, UA-cam has become a great source on mental stimulation. I have had a lot of pleasure from my Ender 3, guided by people like Michael. Although I have had a small engineer's lathe with vertical milling attachment most of my adult life, I had never considered anything like the MPCNC or similar. As time goes by, I get more and more likely to do something silly! :o) Thanks again for the links, and info.
Thanks for this info, I am waiting for a review of Modix Big 60.